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The nonstationary motion of solid body in a liquid
Stejskal, Jiří ; Hlavička, Rudolf (referee) ; Čermák, Libor (advisor)
Obsahem této práce je numerická simulace dvoudimenzionálního proudění nestlačitelné vazké kapaliny. Uvažujeme rotující elipsu soustředně umístěnou v kružnici. Prostor mezi elipsou a kružnicí je vyplněn kapalinou. Cílem je popsat proudění kapaliny vyvolané otáčející se elipsou, tzn. stanovit rychlostní pole a rozložení tlaku. Dále pak chceme stanovit přídavné silové účinky kapaliny působící na elipsu. Tyto výsledky získáme řešením Navierových-Stokesových rovnic metodou konečných prvků. Důraz je kladen na odvození numerického schématu v maticové formě vhodné pro numerickou implementaci. Časově závislá výpočetní síť je popsána pomocí Arbitrary Lagrangian-Eulerian (ALE) formulace. Pro obdržení relevantních výsledků je nutná stabilizace metody konečných prvků. Uvedené výsledky naznačují, že odvozená metoda je dostatečně přesná.
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Design systems used in the field of electrical apparatuses
Stejskal, Jiří ; Krejčí, Jan (referee) ; Valenta, Jiří (advisor)
Bachelor´s thesis is engaged on the base of submitter´s requests company OEZ, s.r.o. and is divided into two parts. The first part of work deals with the most often used 2D CAD systems that are used by designers according to their answers in the area of suggestion of electric switchboards low voltage. In the work are described main possibilities of these systems, then what kinds of data format are supported by them. In the second part of the work are described programs established on calculation of warming switchboards. It goes about programs, which supply concrete producer of switchboard case, and further programs based on method of final elements and method of final volume, which enable graphic representation of results.
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Inverter 12V DC/230V AC
Stejskal, Jiří ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This diploma thesis describes particular parts of power inverter such as gate driver, DSC, LC filter, low power supply, DC/DC converter and four-quadrant bridge and manner of its control by digital signal controller. Inverter is designated for generating of a mobile artificial electric grid (for example in a car).
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Measuring of Velocity Profiles in Liquids by Using of UVP
Kárník, Jan ; Stejskal, Jiří (referee) ; Štigler, Jaroslav (advisor)
The following bachelor's thesis deals with one possible way of determination velocity profiles in liquids. Content of the thesis is focused mainly on the method of the UVP (Ultrasound Velocity Profile), on the ways and principles of measuring, on its pluses and cons and it´s comparison with the other conventional methods, like for the example the PIV (Particle Image Velocimetry) and LDA (Laser Doppler Anemometry). There is also the possible placement of the transducers to the measuring system discussed. Furthermore the thesis deals with trouble in the test measurement. At the beginning this work deals with familiarization with principle and function of the measuring device and with the device for the method UVP itself. Apart from the UVP measuring method the thesis also deals with short description of the competitive methods – PIV, LDA, which are used to measure the velocity profiles nowadays. Particular attention is given to the PIV method, which significance is currently growing. In conclusion, there is comparison of different methods with the UVP method made and there are the future steps to realize the successful measurement with UVP method also discussed.
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Computation of compression force on surface
Stejskal, Jiří ; Habán, Vladimír (referee) ; Čermák, Libor (advisor)
In technical computing we often need to find the resulting load on surface caused by the compression force. The aim of this thesis is to suggest one of the possible approaches to do so if the surface is given explicitly or by the coordinates of some of it's points. In the first section, the mathematical definition of the surface with some of it's important properties is mentioned. There is a basic theory of Bézier surfaces, which form the main part of this thesis in the second part. Further on, some results from the theory of surface integrals are mentioned. The last section describes the whole algorithm of computing the resulting load together with the MATLAB program which is added to this thesis. Three examples are given at the end.
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IT management support of pharmacy
Stejskal, Jiří ; Gála, Libor (advisor) ; Pour, Jan (referee)
This Bachelor Thesis describes the IT management support pharmacy. The goal of my work is to identify the state of supply IT solutions to support the management of pharmacies. To achieve the goal, I first defined an surroundings of selected pharmacy and then I specified its business. I also analyzed the business processes according to the MMABP methodology and examined the information need. Then I conducted market research for IT support in this area. The result of this work should help pharmacies with choosing the right IT support solutions.
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Technology Development of Mobile Devices
Stejskal, Jiří ; Benáčanová, Helena (advisor) ; Řezníček, Dušan (referee)
This thesis is focused on the technology of mobile devices. In the first part I analyse the technical parameters of the mobile device in detail, I mention each parameter and its importance, pitfalls and benefits. The second part is focused on mobile operating systems, especially iOS, Android and Windows Phone. The operating systems are analysed from the perspective of technological complexity, which builds on the analysis of the technology of mobile devices. The third part consists of future prediction. I describe hypothetical future development for both of previous parts of my survey. Approximate future development is mentioned in each chapter of of both first and second parts. The main benefit(contribution) of this work is the compact view on the issue of the technology of mobile devices. It helps reader to make a complex overview of the evolution and possibilities on the current mobile devices market.
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Presentation of the company and their products using various graphical techniques and procedures
Stejskal, Jiří ; Šedivá, Zuzana (advisor) ; Benáčanová, Helena (referee)
The essay addresses the issues of the proper principles of company presenting from the perspective of corporate indentity and options of product presentation. First part of the essay is devoted to the topic of expressing certain traits with graphic procedures, which are demonstrated on concrete examples. We are going to deal with issues of dynamics, power, simplicity or complexity and colour. Further away essay is devoted to the issue of creating of individual elements of company design - corporate brand, business cards and approaches paper as a portable media. Then essay is devoted to comparison of suppliers of company design, reflects the difference between tradesman graphic designer and major graphic studio and also mentions basic computer applications, which are suitable for creating graphic elements. The second part of the essay is devoted to comparison of various web portals in terms of their presentation, clarity, colour balance, but mainly in terms of product presentation with usage of various graphic techniques, product description and related issues of navigation menus. The conclusion of the work is devoted to new trends in area of product presentation. Portals for comparison were intentionally chosen with various specializations and there are new techniques of presentation mentioned for each one.
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