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Development of the poly(methylene blue) modified graphite electrodes for the electrochemical detection of hydrogen sulphide
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
A comparative study have been undertaken of the electropolymerization and electrochemical properties of deposited electroactive polymer on two different graphite electrode substrates: 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 hydrogen sulphide.
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Prediction of Betting Odds Based on Logistic Regression
JANDA, Pavel
Betting odds in various areas of human life is becoming very popular. This Bachelor's Thesis deals with the prediction of betting odds based on logistic regression. This work describes general information about betting odds, the history of betting odds both here in the Czech Republic and abroad, the forms of betting odds, who is a bookmaker and how betting odds are created. There are 3 sets of data. Specifically, it is the advantage of the home ground, the pre-match table and previous matches. Data is processed by lo-gistic regression to predict betting odds. The three above conditions are included in the Statistica program, which calculates the probability of each variant based on logistic regression. The results from the Statistica program are then compared to the actually listed betting odds.
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Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
This research is focused on the electrochemical synthesis and characterization of\npoly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane\nhighly oriented pyrolytic graphite (HOPG) and pencil graphite electrode (PGE), have been\nmodified by conductive film of pMB. Electrochemical properties and nanomorphological\nchanges have been investigated by cyclic voltammetry and atomic force microscopy.\nImproved electroactivity of the modified electrodes (PGE/pMB and HOPG/pMB) towards\nsulfhydryl group has been observed and examined modified electrodes were researched for\ntheir possible application in electrochemical sensor for hydrogen sulfide in aqueous solutions.
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Site-dependent growth of Norway spruce, the Hrubý Jeseník Mts.
Boszczyková, Dita ; Treml, Václav (advisor) ; Janda, Pavel (referee)
Ring - wight chronologies of Norway spruce (Picea abies) from the twelve sites in the Hrubý Jeseník Mountains have been developed to study radial growth variability and a response to interannual climate variation. The sampled sites have been examined at three different elevations along the treeline ecotone according to the southwest and northeast aspect: in the closed-canopy forest at the lowest part of ecotone and in the tree groups at the lower and upper part of ecotone. The results have shown that the radial increment on the south-facing slopes has been slightly larger in the closed-canopy forest, particularly with the oldest trees. There have not been any differences in increment between the southwest and northeast slopes in the tree groups. The period of growth depression was detected during the 1970s and the 1980s at all sampled sites. This decline was probably a result of the effect of the air pollution combined with decreasing temperatures. An increasing trend in tree growth since the 1990s corresponds with the increasing temperatures and increasing nitrogen inputs at the sampled site. On each site, there has been a positive relationship between the current-year radial growth and the mean monthly temperatures in the growing season. In the individual months, there is a shift from the...
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Interaction of group III and IV metals with Si(100) surface in temperature range from 20 to 800K
Setvín, Martin ; Ošťádal, Ivan (advisor) ; Janda, Pavel (referee) ; Klapetek, Petr (referee)
1 Title: Interaction of group III and IV metals with Si(100) surface in temperature range from 20 to 800 K Author: Martin Setvín Department: Departement of Surface and Plasma Science Supervisor of the doctoral thesis: Doc. RNDr. Ivan Ošt'ádal CSc. Abstract: Interaction of group III and IV metals with Si(100) surface was studied by STM (Scanning Tunneling Microscopy) and AFM (Atomic Force Microscopy) in temperature range from 20 to 800 K. Adsorption and hopping of single metal adatoms on Si(100)-c(4×2) reconstruction can be observed by STM at low temperatures. Activation energies and frequency prefactors for hopping of single indium atoms were measured by two meth- ods - direct STM measurement at low temperature and Kinetic Monte Carlo simulations of layer growth at room temperature. Group III and IV atoms self-assemble into single atom wide chains on Si(100) surface at about room temperature. Atomic and electronic structure of the chains was investi- gated by means of STM and dynamic non-contact AFM. Keywords: Si(100), STM, AFM, adsorption, diffusion
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Constitutional aspects of the termination of the Czechoslovak Federation
Janda, Pavel ; Gronský, Ján (advisor) ; Jirásková, Věra (referee)
- Constitutional aspects of the termination of the Czechoslovak Federation The thesis deals with problems of constitutional aspects relating to termination of the Czechoslovak Federation, which was abolished on 31.12. 1992 I have chosen this theme because I am interested in this theme since the first grade of my studium at the Law faculty. I had better access to this theme after the attendance of Scientific seminar leaded by Doc. Gronský called Slovakia in constitutional history of Czechoslovakia. The thesis uses sources available to students of Law faculty (monography, collections, university textbooks, texts of laws, articles, stenograph records, university lectures). The thesis is grounded on the synthesis of many sources with emphasis on consistent citing sources of the original authors. The thesis is composed of three chapters, which are divided into subchapters. These subchapters contain parts. In introduction I set the aim of thesis to describe the aspects of termination Czechoslovakia. For better context is in thesis genesis and development of the federation. Chapter one consists of two subchapters. There are described conditions of formation of Czechoslovak state. Chapter two consists of four subchapters, which describe Constitutional development of Czechoslovakia (1918-1989) with focus on...
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Italian Fascism in the View of Theory of Elits
Janda, Pavel ; Buben, Radek (advisor) ; Voráček, Emil (referee)
This paper summarizes the interpretations of fascism from the first half of the twentieth century. Then the paper sets two points of view and compares them. The first is the point of view of the opponents and critics of fascism, whether it would be communists or liberal democrats. These critiques are confronted with Mussolini's seeing of fascism. His conceptions are supplemented by other works of other supporters of fascism or by the official materials of fascist movement (or party). Everything is seen from the point of view of the theory of elitism.
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Control of the industrial robot with cameras
Janda, Pavel ; Obdržálek, David (referee) ; Hlaváč, Václav (advisor)
This thesis belongs to the implementation category of diploma theses. The work contributes to the EC project COSPAL, IST-2003-004176. The main goal of the project was the creation of the system of control and processing of the camera information for the assembly task. The demonstrator is used within the scope of the COSPAL project to solve a child's game - shape sorter puzzle. For solving the puzzle, the industrial robot CRS Robotics A465 was used. The robot has been available at the supervisor's place.
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Effect of substrate hydrophobicity on the electrocatalytic behaviour of phthalocyanine
Klusáčková, Monika ; Janda, Pavel ; Tarábková, Hana
In this work, the electrocatalytic activity of pyridinoporphyrazine mediator deposited on two substrates with different hydrophobicity has been presented. We focused on hydrophobic highly oriented pyrolytic graphite (HOPG) as well as hydrophilic annealed gold electrode (Au111). The immobilization of mediator has been carried out spontaneous adsorption from aqueous solution on electrode surfaces. The different hydrophobicity surface resulted in change the electrocatalytic activities of mediator to hydrogen in aqueous solution. For this purpose, electrochemical, in situ spectroelectrochemical, and ex situ microscopically characterizations have been performed. The detailed comparison of surface morphology, surface coverage, surface roughness parameters, thickness of deposited layers of mediator, and pH solution has been studied.
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