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Stabilized operation and short - circuit conditions within E.ON 110 kV power network supplied from Sokolnice 110kV switching station, during the period of 2011
Jandora, Jiří ; Janda, Petr (referee) ; Blažek, Vladimír (advisor)
While changing the connection of the power transformators we have to find out if the powered distribution network can accept this change and if it will fulfil the set conditions. Important is to keep the range of permitted voltage on separate distribution points of this network and to find out proportions on separate circuits. This is connected with a circuit load which cannot exceed its limit (transmission capacity). The network is checked against outages of separate circuits (N-1) and we try to find out if other circuits are not overloaded during the transmission of the outaged circuit’s power. We can also suggest various other possible outages. It is also important to find out whether separate distribution points agree with their short-circuit capabilities. Overall we investigate advantages of this circuit. The theoretical part describes the means of calculation of the network functioning and short-circuit conditions. All the calculated results (dispatcher control system Sinaut Spectrum) for the given circuits of power transformators are processed and evaluated in the practical part of the thesis.
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Design of operation of a new 120 MW Maloměřice heating plant power source in E.ON 110 kV power distribution network
Janda, Petr ; Vaculík, Petr (referee) ; Blažek, Vladimír (advisor)
Before putting new power distribution installation into operation and before the connection to grid is needed to validate connectivity of the installation. Purpose of verification is to check compliance with the technical conditions of relevant regulations. Ones of the most important conditions include compliance with the prescribed connection voltage tolerance at the connecting device – and even in the worst-case – and provide necessary short-circuit capability of the other devices in a connected grid. Main task of my master’s thesis is just checking that the voltage tolerance and the control of short-circuit resistance. The calculations were performed by using the dispatching control system that works with the current parameters of the distribution system equipment 110 kV. Theoretical part of thesis describes two main points of the method of calculating the network operation and the method of calculating short-circuit conditions. Based on these theoretical processes are relevant input data processed and evaluated in the dispatching control system. The calculation and evaluate results are presented in the final part of the master’s work.
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Production of anchor foot
Janda, Petr ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The present bachelor thesis deals with a design of anchor foot used for fixing wooden beams in the manner that, prevents a direct contact of the beam and the subsoil. It is made of bent metal sheet of 4 mm thick steel 1.0038 in the production run of 80 000pcs/year. A combination of shearing and bending at a follow tool was selected from among various options as the most appropriate. On the basis of technological, structural and control calculations, tool were designed and the technical documentation was elaborated. A blank sheet of metal with dimensions of 4 x 1500 x 3000mm (using 94%) was chosen as a semi-finished product. On the basis of the total shearing force, which was greater that the bending force, the same press CDCS 2500 P81 made by the company Dirinler was selected for both tools. Using the economic evaluation, production costs per one anchor foot were calculated in the amount of 102,3CZK, including 30% profit of the company. According to the calculated turning point, the production becomes profitable after manufacture of 12106pcs.
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Electrochemical Characterization of Poly(methylene Blue) Modified Graphite Electrodes
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
This work deals with electrochemical study of methylene blue (MB) polymerization as well as characterization of deposited conductive film on basal plane highly oriented pyrolytic graphite (HOPG) and pencil-graphite electrode (PGE). Poly(methylene blue) modified electrodes (HOPG/pMB and PGE/pMB) have been prepared by potential cycling in aqueous electrolyte solution containing methylene blue monomer. It has been found that electrochemical properties and electrocatalytic activity of deposited film are greatly influenced by the type of electrode substrate. Developed electrodes have been further investigated as potential sensors for sulfhydryl-containing compounds.
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Influence of Electrode Preparation on Electrocatalytic Activity of Tetrapyridinoporphyrazinato Cobalt(II) Complex to Propylene
Klusáčková, Monika ; Janda, Pavel ; Tarábková, Hana
The water-soluble complex N ,N' ,N' ',N' "-Tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt (CoTmt-3,4-ppa) has been deposited by different techniques on two substrate. Electrochemical deposition, spontaneous adsorption, and spin coating have been used to the modification of two electrode material: annealed gold as hydrophilic substrate and highly oriented pyrolytic graphite as hydrophobic substrate. The modified electrodes have been characterized using cyclic voltammetry, backscattering VIS spectroscopy and atomic force microscopy. The influence of substrate material and modification techniques on electrocatalytic activity of CoTmt-3,4-ppa modified electrodes for propylene oxidation has been studied.
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Gaseous nanodomains at solid/liquid interface
Janda, Pavel ; Tarábková, Hana ; Klusáčková, Monika
Existence of gaseous nanodomains at solid liquid interface (surface nanobubbles) has been presumed first by Phil Attard and his fellow workers (1) based on discovery of long range attractive forces between two adjacent planar solid surfaces immersed in water. Attard et al. ascribed forces and their discontinuous character to sub-micro bubbles bridging both immersed surfaces.
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Electrocatalytic Oxidation of Unsaturated Hydrocarbons Mediated by Phthalocyanine Derivate
Klusáčková, Monika ; Janda, Pavel
The oxidation of ethylene and propylene respectively, mediated by thin layer -tetramethyltetra-3,4-pyridinoporphyrazinocobalt, simply called CoTmt-3,4-ppa, deposited on basal plane of highly ordered pyrolytic graphite (HOPG) was studied in aqueous phosphate buffer phosphate solution by cyclic voltammetry, backscattering spectroscopy and atomic force microscopy. Our interest has been focused on optimizing conditions of electrocatalytic oxidation unsaturated hydrocarbon on electrode modified by pyridinoporphyrazine.
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Telepresence
Parkan Janda, Petr ; VOJTĚCHOVSKÝ, Miloš (advisor) ; BLAŽÍČEK, Martin (referee)
The aim of my thesis Telepresence, from art to everyday life is to outline the basic facts about evolution of Telepresence. In specific cases, I try to illustrate its shapes and forms. My thesis is based on work of seven artists, which reflects changes in telepresence from the eighties to the present. I examined the fact, that telepresence changed from exclusive art into everyday media. At the end, I ask myself question, how society adapted to the massive growth of telepresence in everyday life.
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Natorp's System of the Syntetic Function of Reason and Theory of Number
Janda, Pavel ; Pavlík, Ján (advisor) ; Bartoň, Petr (referee)
Presented paper is concerned with Paul Natorp's system of the synthetic function of the reason and its influence on the theory of number. I will try to show that present system of the number theory suffers from some significant drawbacks and Natorp's theory may be able to amend them. Natorp elaborates his theory on the basis of Kantian categorical system and Kant's transcendental philosophy. In my paper, I would like to achieve two goals. Firstly, I would like to support Natorp's statement that we need to be concerned with the logical system of our concept's originating. Secondly, I will try to defend Natorp's theory against accusations of psychologism.
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Electroanalysis with phthalocyanine modified HOPG electrodes
Mansfeldová, Věra ; Janda, Pavel
In this papers we presented modification of highly oriented pyrolitic graphite (HOPG) by two different phthalocyanine (Pc) derivatives and two different deposition techniques. We have investigated electrode modified by fullerene-derived phthalocyanine and cobalt tetraneopentoxyphthalocyanine (CoTNPc) to consider how different modification procedure-electrodeposition and drop evaporation and composition of phthalocyanine influences detection of model compound, L-cysteine.
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