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Analysis of the City Management of Příbram
Vávrová, Jana ; Pucandlová, Miroslava (advisor) ; Matějka, Milan (referee)
This bachelor thesis deal with the analysis of economy of the town Pribram during years 2006 to 2010. The aim is to assess economy and identify reasons for the changes of individual budget items, property and sources of coverage. There is evaluated investment activities of the city in the end. Thesis is divided into two parts. It is theoretical and methodical part and following practical part. Theoretical and methodological part is focused on definig the basic topics. Topics are municipality, it's authorities and structure, scope, budget and balance sheet of the city. Practical part is specialised in basic information about the city, analysis of revenue, expenditure, assets and liabilities. And then rate basic indicators of financial analysis, budget outlook and investments. I the conclusion is an overall assessment of economy of the town. For this analysis were used budgets, financial reports and balance sheets of the years from 2006 to 2010.
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Scanning Probe Microscopy: Measuring on Hard Surfaces
Matějka, Milan ; Urbánek, Michal ; Kolařík, Vladimír
During a measurement by scanning probe microscopy (SPM) an image artifacts can appear in a measurement data. The source of image artifacts during an SPM measurement could be in parts of the SPM tool: mechanical system, piezoelectric crystal, scanner electronic. However, the main source of image artifact is the probe tip geometry and properties of the sample. For example, probe wearing, which occurs during the contact measurement on a sample with a hard surface, could result in heavy probe shape change, causing probe-related image artifacts. Measurement could appear problematic on a sample with periodical relief structure (e.g. gratings with sub 10 μm periodicity) prepared in hard materials (e.g. silicon), when the structure height is greater than about 500 nm. In this case, probe can easily get struck during the scanning, on the hard surface as well as at the high aspect ratio relief structure, causing image artifact thus reducing measurement quality.
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SPM Nanoscratching in the Sub 100 nm Resolution
Urbánek, Michal ; Kolařík, Vladimír ; Matějka, Milan
Scanning probe microscopy (SPM) is tool basically used for surface characterization. Besides that, it offers several lithographic methods (e.g. nanoscratching) to prepare structures in the sub 100 nm resolution. The nanoscratching using SPM offers a method for patterning of surface with a very high resolution based on near field interaction. By this method some tiny marks or taggants could be prepared. Therefore we used the SPM nanoscratching for preparation of nanostructures in thin soft polymer films by various tips. Nanoscratching regime of SPM is possible to operate in contact and close contact modes. In the contact mode we prepared an array of stamps with a variable size, where dimensions and depth dependency on number of pixels were inspected. For writing of these structures we used polymer films with different softness (e.g. PMMA, SU-8) and various values of setpoint, which are responsible for structures deepness.
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Visualisation of Boundary Layer Separation and Passive Flow Control on Airfoils and Bodies in Wind-Tunnel and In-Flight Experiments
Popelka, Lukáš ; Kuklová, J. ; Šimurda, David ; Součková, Natálie ; Matějka, Milan ; Uruba, Václav
Infrared camera, Particle Image Velocimetry, smoke-wire, tuft filaments and oil-flow visualization techniques were used for wind-tunnel and in-flight investigation of boundary layer separation, both stall and separation bubbles, related to the low-Reynolds numbers transition mechanism. Airfoils of Wortmann FX66 series and FX66 series wing-fuselage interaction, as well as modern airfoils and their wing-fuselage geometry were subject to study. The presence of previously identified structures in the CFD modelling, such as horse-shoe vortices, was confirmed in the flow.
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The rise and development constructions
MATĚJKA, Milan
This baccalaureate work is occupied problems of architecture styles. It is devided into two parts. Theoretical part is based on the hystory of constructions from long past cultures. Individual architecture styles are arranged in chronological sequence running from past to the present. Change from the first part to second part is made of chapter about the construction of underground in Prague and its compare with tunnel Blanka. Practical part is based on the real realization of tunnel Blanka. There are described individual steps of construction this tunnel. More, there is attached project documentation and visual photographs. The development of tunnels stands on the top of interesting of traffic engineering and it depends on the time, when the similar constructions will be realized in the regional towns.
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Visualization of Flow Separation and Control by Vortex Generators on an Single Flap in Landing Configuration
Součková, Natálie ; Kuklová, J. ; Popelka, Lukáš ; Matějka, Milan
This paper focuses on a suppression of the flow separation, which occurs on a deflected flap, by means of vortex generators (VG's). An airfoil NACA 63A421 with a simple flap and vane-type vortex generators were used. The investigation was carried out by using experimental and numerical methods. The data from the numerical simulation of the flapped airfoil without VG's control were used for the vortex generator design. Two sizes, two different shapes and various spacing of the vortex generators were tested. The flow past the airfoil was visualized through three methods, namely tuft filaments technique, oil and thermo camera visualization. The experiments were performed in closed circuit wind tunnels with closed and open test sections. The lift curves for both cases without and with vortex generators were acquired for a lift coefficient improvement determination. The improvement was achieved for several cases by means all of the applied methods.
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Numerická simulace aerodynamické interakce křídla a trupu
Šimurda, David ; Popelka, Lukáš ; Zelený, L. ; Matějka, Milan
In order to investigate and understand extent of the wing-body interaction effects taking place during operation of a particular self-launching sailplane, commercial code Fluent 6.3 was used for numerical simulation of flow past a simplified model of TST-10a. Several methods were used to identify vortex structures originating due to interference effects in this part of the aircraft. 3D effects and distortions of pressure and velocity distributions taking place in the junction of the body and the fuselage were observed.
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