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Modification of polyurethane by biodegradable poly(hydroxybutyrate)
Kupka, Vojtěch ; Žídek, Jan (referee) ; Vojtová, Lucy (advisor)
Cílem předložené bakalářské práce byla syntéza elastomerního polyuretanu plněného biodegradabilním polyhydroxybutyrátem. Vzorky byly podrobeny analýze morfologie pomocí rastrovací elektronové mikroskopie, mechanické vlastnosti byly testovány jednoosou tahovou zkouškou. Práce se taktéž zabývá předpovědí mechanických vlastností na základě teorií kaučukové elasticity. Bylo zjištěno, že výsledný materiál je částicový kompozit, kde se vzrůstajícím hmotnostním obsahem plniva v materiálu vzrůstá modul pružnosti. Predikce tahových křivek pomocí softwaru SEC.exe ukazovala pro reálný průběh křivky nereálné hodnoty hustot polymerních řetězců. U modelů, které vykazovaly reálné hodnoty hustot, byly naopak hodnoty napětí vyšší, než ve skutečnosti naměřené.
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Správa knihovny
Marchenko, Maryna ; Klímek, Jakub (referee) ; Nečaský, Martin (advisor)
In the given thesis all the steps of studying and writing a program for the management of a library are worked out. In the rst chapter the requirements of the client ordering this software are analyzed. The possible solutions are o ered. In the next part a study about barcodes and barcode readers is given, as the books and users of the library will be given barcodes. The third chapter includes a precise user documentation, explaining how to use the program. Next there is a programmer documentation explaining some interesting parts of the code and introducing the programming language that was chosen. It is then that a conclusion is made and possible future improvements are proposed.
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Electrically short multiband antenna for radioamateur use
Müller, Marek ; Šebesta, Jan (referee) ; Lukeš, Zbyněk (advisor)
The purpose of this work is identification with theory of EH antennas, do the simulation of one choice of model of EH antenna from literature and this model optimise on required frequency 14 MHz through the use of computer software CST Microwave Studio. The practical part of work is to produce choice model of EH antenna, to mete his properties and to verify use in real traffic. The EH antenna is an electromagnetic electrically short antenna, which can work as a transmitting or receiving antenna. The main characteristic of EH antenna is distributed radiating electromagnetic field, whose electric component E and magnetic component H are mutually crossed and orthogonal. The advantage of EH antennas is, that they have much smaller size on frequencies in order of magnitude MHz in comparison with conventional antennas (e.g. half-wave dipole). Their disavantages are their more complicated construction and tuning of the antenna, which must be made again, when the position of antenna is changed. Therefore the EH antenna is not so suitable for mobile application.
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VCL Components for Vector Graphics in the Instruction of Chemistry
Adamec, Martin ; Cihelník, Simon (advisor) ; Havlová, Michaela (referee)
Předmětem práce je zhodnocení problematiky vzorců ve výuce organické chemie na střední škole, zhodnocení současného stavu softwaru pro kreslení chemických struktur a vývoj VCL komponent pro chemické kreslení. V současnosti dostupný software je na vysoké odborné úrovni a v chemické praxi má široké použití, nehodí se však pro použití ve výuce na druhém a třetím stupni. Výsledkem práce jsou komponenty pro vytváření, zobrazení a manipulaci s chemickými vzorci jednoduchých organických látek v souladu s požadavky střední školy Součástí práce je také aplikace ukazující základní vlastnosti vyvinutých komponent. Kom- ponenty i aplikace jsou vytvořeny v prostředí Borland Delphi 2005. CD s elektronickou verzí textu, zdrojovými kódy komponent i aplikace a spustitelnou verzí aplikace je přiloženo.
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Reinforcement concrete column strengthening via steel bandage
Stloukal, Štěpán ; Laníková, Ivana (referee) ; Šimůnek, Petr (advisor)
The steel bandage is an economical and effective widely used method for strengthening RC columns. Diploma thesis reviews most common design proposals for the types of the bandage with directly loaded and not directly loaded steel angles. This work also includes a comparison of the different constitutive laws for confined concrete. In order to simulate real behaviour of strengthened structure the numerical analysis has been carried out using non-linear software ATENA. According to the European standards and adopted hypotheses the simplified analytical model has been derived to be able to calculate load-bearing capacity of a strengthened column under normal force and bending moment. The proposed model considers the contribution in confinement pressure caused by steel bandage and the contribution of directly loaded angles. In addition, the direct application on real frame structure has been performed.
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Contour lines to heightfield conversion
Klimeš, Jonáš ; Pelikán, Josef (advisor) ; Dupej, Ján (referee)
Title: Contour lines to heightfield conversion Author: Jonáš Klimeš Department: Department of Software and Computer Science Education Supervisor: RNDr. Josef Pelikán, Department of Software and Computer Science Education Abstract: The task of this project is to design and test algorithms for semiautomatic contour lines conversion to height field. This work tries to solve following problems: automatic connection of disconnected contour lines, adjacent paths finding, semiautomatic ordering of contour lines with user assistance, creating of terrain height field using Catmull-Rom splines or radial basis functions. A part of this thesis is an experimental application, which implements these algorithms and displays the process of conversion. Program input are in form of contour lines in SVG vector format. Output 3D meshes are in Wavefront OBJ format. Keywords: contour lines, height field, terrain
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Development of solar diffuser.
Pintr, Pavel
Theoretically attainable productions of photovoltaic plants depend on the quality of solar sensors. We can determine an effeciency and reliability of photovoltaic plants with them. We introduce optical simulation of the original solution of solar sensor in software Optic Studio 15.5 Zemax. We propose new diffuser shape of solar sensor according to our analyse. We\ndescribe a development of first prototypes and their testing in the real conditions.
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Mesh mending
Masařík, Tomáš ; Pelikán, Josef (advisor) ; Krajíček, Václav (referee)
The bachelor work is focused on triangle meshes mending. It includes topological and also geometrical aspects. I continue working on Individual Software Project and Software Praxis. Before I have created program capable of detecting and repairing some of triangle mesh errors. Main goal of creation such a program was a research using scans of human faces at Faculty of Anthropology of Nature Science at Charles University in Prague. There are analyzed issues and there are evaluated existing solution in this paper. In second section I describe implemented algorithms, user's and programmer's documentation as well. The results are demonstrated At the end and there are proposed some future extensions.
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Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon
Jirásek, Vít ; Prajzler, Václav ; Remeš, Zdeněk
Nanocrystalline diamond (NCD) coatings on planar waveguides (WG) in the IR region allow to design optical sensors sensitive to absorbers like proteins or other biomolecules. In this contribution, we present a 2D model of a multi-layer WG developed under FEM (finite element method) simulation software Comsol Multiphysics. The model is based on the modified wave equation solved in the frequency domain and includes optical absorption. It was found that for the single-mode WG working in the narrow region of 1550-2000 nm the silicon thickness must be 150-320 nm. It was found that in order to keep a reasonable signal attenuation, the NCD film must be prepared with the optical absorption coefficient lower than 10 cm-1, being a rather challenging task. Dependencies of the signal attenuation on the NCD film thickness, absorbing layer height, its absorption coefficient and exciting wavelengths are presented.\n
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Choosing an antivirus program
David, Jan ; Pícka, Marek (advisor) ; Hanzlík, Petr (referee)
This bachelor thesis is focused on choosing a free antivirus software for basic internet usage on a personal computer.
The first part focuses on the issue of malicious software and is divided into categories based on various viewpoints. In addition, several types of prevention are mentioned. This part also explains the history of antivirus software.
The second part contains the actual comparison of five freeware antiviruses. Selection of these five programs is based on a survey. The test consists of five criteria: time of computer deep scan, disc usage, memory usage, user interface and safety rating by AV-Test. These criteria are weighted using Saaty method and the final result is calculated using a weighted sum method.
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