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Measurements of velocity in the channel bottom boundary layer, using Particle Image Velocimetry
Vrubel, Jan ; Haluza,, Miloslav (referee) ; Zubík, Pavel (advisor)
The theme of this thesis is continue on examining relatively commonly used measurement flow field metods, which assessing the variables flows at a high level. Thesis follow up mainly the flow field in the channel bottom boundary-layer and its depending on different factors. To calculate velocity in boundary-layer is common used extrapolation method, because this boundary layer is only the small part of measuring cross section. Increase the accuracy of measurement of flow variables make the flow in the boundary layer also important. Thesis is a summary of a basic theory of flow field, but mainly is about dependent local flow velocity on position, and about deformation of flow field in boundary layer. The aim thesis is description different calculation methods of flow flow field in boundary layer and comparison to with real condition which was measured in laboratory UVS-LVV. Real condition flow field in channel bottom boundary layer is based on exact method Particle image velocimetry. The measurement results serve to compare commonly used calculation methods or different theories velocity in the channel bottom boundary layer. Outputs this thesis offers comparison, confirmation or specification calculation methods according to the results. It has been suggested several limitations on certain methods of calculation, or coefficient were modified or alternative has been proposed to calculate them.
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Thick-film sensors for heavy metals detection
Polický, Jiří ; Adámek, Martin (referee) ; Prášek, Jan (advisor)
This work covers an area of heavy metals detection using thick-film sensors. Fabrication of screen-printed thick-film sensor and electrochemical analytical methods for detection of chemical elements in aqueous solutions are described in this work. Several commercial and own prepared thick-film pastes were used for carbon based working electrodes. The electrochemical properties of the pastes were examined by cadmium ions detection in potassium chloride solution using differential pulse voltammetry. The best results were achieved on the electrode made of direct grown carbon nanotubes on the electrode layer NM22. A detection limit 20×10-6 mol l-1.was reached with this working electrode material during oxidation process.
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Single-layer PCB and additional conductive layer realisation
Hladík, Jaroslav ; Stejskal, Petr (referee) ; Starý, Jiří (advisor)
This bachelor’s thesis deals with problems following the fabrication of the second conductive layer on a one-sided printed circuit board. Also, properties of basic materials for a printed circuitboard farbication and combinations of basic materials are disscussed. Moreover, technological tests and their evaluation made according to recommended norms are content of this thesis.
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Electron cryo-microscopy techniques in biological research and nanotechnologies
Mistríková, Veronika ; Bednár, Jan (advisor) ; Nebesářová, Jana (referee) ; Benada, Oldřich (referee)
Preparation of biological samples for transmission electron microscopy is not a trivial task. The samples must withstand a vacuum environment present inside a microscope, and it is often necessary to use non-physiological procedures for their processing. These procedures usually involve aldehyde-based fixation, replacing water with alcohol (i.e. dehydration/substitution), and embedding into a resin, which creates support for the subsequent preparation of thin sections that can be placed into the microscope. In the last decade, the method of cryo-fixation (vitrification) using ultra-fast high-pressure freezing followed by freeze substitution and low-temperature resin embedding gained a dominant position in the cell biology research. In this way, a range of biological samples with a thicknesses up to several hundreds of micrometers was successfully vitrified to a state that was closely related to their in vivo structures. The cryo-fixation of isolated biological objects (with a limited thickness up to several micrometers) is possible in a thin layer of vitrified water by plunge freezing at ambient pressure. In combination with electron cryo-microscopy, this method has become the most effective and fundamental principle for the high-resolution studies and image analysis of fully hydrated samples...
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Measurement of electro-optical properties of quantum-size structures based on InAs/GaAs - photocurrent and electroluminescence
Mačkal, Adam ; Hazdra, P. ; Hulicius, Eduard ; Oswald, Jiří ; Pangrác, Jiří ; Melichar, Karel ; Hospodková, Alice ; Šimeček, Tomislav
Contribution presents the electroluminescence, photoabsorption and polarization properties of semiconductor lasers with thin strained InAs layers in GaAs at elevated temperatures. The lasers exhibit high optical recombination efficiency, low threshold current density and wide temperature operation range (above 100řC).
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Semantic diatheses in Czech and other Slavonic languages
Skwarska, Karolína
In the presented paper different types of so called semantic diatheses in Czech, Russian and Polish are examined. Diathesis is understood as a relation between two constructions of the same situational content and one verb lexeme, which are syntactically structured in different ways. The comparative approach is emphasized – the differences among languages are studied on surface and deep layers. We analyze certain semantic groups of verbs and their ability to function as a basic member of specific diatheses. Very complicated relations are demonstrated on lexemes léčit, prořezat and its Polish and Russian counterparts.
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A grammatical sketch of the Romani dialect of Versend, Hungary
Bodnárová, Zuzana ; Beníšek, Michael (referee) ; Elšík, Viktor (advisor)
The primary goal of the thesis is to provide a grammatical description of the Romani dialect of Versend (southern Hungary), an isolated and endangered South Central variety, which is transitional between Vendic and non-Vendic (Rumungro) subgroups of South Central Romani. The body of the thesis is divided into four main chapters. The first chapter deals with phonology and morphophonology, including a description of the phoneme inventory, vowel adaptation and quantity, and various sound changes. The second chapter is devoted to morphology and includes a description of the inflection and derivation of nouns, adjectives, and verbs. The third chapter deals with basic and complex syntactic structures and basic word order. The fourth, last, chapter is a brief analysis of the vocabulary of Versend Romani; it focuses on diachronic layers of lexical loans - especially from South Slavic languages - and provides a lexical analysis of selected semantic areas. The thesis also contains a brief description of the current sociolinguistic situation of Versend Romani and a vocabulary of Versend Romani translated into Hungarian and Czech. The linguistic data is based on both recordings of spontaneous narratives and linguistic elicitation by means of standardized dialectological questionnaires.
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Form and function of nouns in Czech: relation between nominal case and syntactic function. Based on a synchronic written corpus of Czech (SYN2005)
Jelínek, Tomáš ; Petkevič, Vladimír (advisor) ; Lopatková, Markéta (referee) ; Uličný, Oldřich (referee)
The case in Czech is the basic morphological means by which nouns express their function in a sentence. The objective of this thesis is to describe, from a frequency point of view, the relation between form and function of nouns, or, more precisely, how frequently cases (both simple and prepositional) are used to realise syntactic functions in sentences. The thesis is based on one of the largest corpora of written synchronic Czech: 100-million-token corpus SYN2005. In order to obtain data on frequencies of syntactic functions of nouns in relation to their cases, we annotated the corpus SYN2005 with a dependency syntactic annotation. For this annotation, we adopted the format of the analytical layer of the Prague Dependency Treebank. The syntactic annotation has been performed by a stochastic parser: the MST parser. Since the reliability of this annotation was not high enough, we have built an automatic correction module, which identifies errors of syntactic annotation in the output of the stochastic parser and corrects these errors by means of linguistic rules. We have implemented 26 different rules, but annotation errors have been reduced by merely 6-8%. However, this correction module can be further developed. It can be used to correct the output of any dependency parser trained on the data from...
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