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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
921

Materiálově nelineární řešení prutových konstrukcí / Material nonlinear solution of beam structures

Kabeláč, Jaromír Unknown Date (has links)
The dissertation deals with solution of beam and frame structure considering material nonlinearity. The finite elements method (FEM) was used as calculation method. The objective of the dissertation was to develop and test finite beam element considering material nonlinearity. A detailed analysis of the problem provided a group of formulations of beam element. Part of the dissertation´s results has been, in several forms, implemented in commercial software. Beam element focused on solution of stress over solid cross sections is introduced in the theoretical part. In terms of topology it is a classical prismatic beam element with two nodes. Six degrees of freedom for translations and rotations are defined in each node plus 7-th degree of freedom for warping function from torsion. Load form axial force, bending moments, primary torsion, shear forces and eventually bimoment for secondary torsion were considered in cross section. Several variants of formulations were created according to inclusion of loading components into material nonlinearity and according to numeric integration method. Inclusion of geometric nonlinearity and fire resistance calculation are discussed in the dissertation. The above mentioned formulations were tested on prototypes as described in the application part which also provides information on the general procedure, architecture and technologies used for implementation of knowledge from the theoretical part into commercial FEM software. The dissertation shows implementation of plasticity for shell, solutions of cross section characteristics and stress on cross section, implementation of beam element with material nonlinearity and module for fire resistance of column. The above mentioned implementations of theoretical conclusions are the main outputs of the dissertation. These implementations are available in thousands of installations throughout Europe where being used at projection of significant constructions.
922

Zaměření části Dominikánského kláštera ve Znojmě / The Mapping Survey of the Dominican Convent in Znojmo city

Balák, Martin January 2017 (has links)
The subject of this diploma thesis is a survey of the Dominican monastery in Znojmo. The thesis deals with the requirements for building documentation. The thesis contains floor plans of the second floor, the ground plan of the third floor and the vertical section of the building. The resulting documentation will serve the National Monument Institute for the planned reconstruction of the building.
923

Aplikace pro monitorování serverů s operačním systémem Linux / Application for monitoring of Linux servers

Kačmarčík, Martin January 2019 (has links)
PlanetLab Server Manager je aplikace, která pomáhá uživatelům realizovat projekty zaměřené na vývoj aplikací pro distribuované sítě. Aplikace primárně umožňuje vyhledávání serverů podle jejich geografické polohy a umožňuje přístup na tyto servery a jejich vykreslení na mapě. Práce čtenáře seznámí se síťí PlanetLab a její infrastukturou. Dále popisuje aplikaci PlanetLab Server Manager (také známou jako plbmng) a identifikuje problémy v její aktuální verzi. Diplomová práce se zaměřuje na řešení identifikovaných problémů a specifikuje provedená vylepšení do aplikace. Také je v ní pomocí nově přidané funkcionality provedena analýza stavu sítě PlanetLab. Tato práce se zaměřuje na vylepšení stávající funkcionality tím, že je aplikace plně přepsána do jazyka Python 3. Kvůli stávající implementaci v jazyce Bash, jehož vlastnosti se od jazyka Python liší, bude nutné kompletně přeplánovat stávající funkce aplikace, aby bylo plně využito výhod jazyka Python. Aplikace je také rozšířena o možnosti filtrování serverů na základě jejich stavu a další vylepšení. Zdrojové kódy aplikace jsou dostupné na repozitáři GitHUB pod licencí MIT a dále je aplikace dostupná v repozitářích PyPI.
924

Způsoby vyhodnocování nehodovosti a jejich optimalizace / Methods of accident evaluation and their optimization

Soukupová, Tereza January 2020 (has links)
The thesis deals with the comparison of accident assessment methods and their optimization in the Czech Republic and other selected countries. The work is based on the methodologies of individual countries, which were examined and then compared and evaluated in terms of practical use. The gained theoretical knowledge was applied to practical examples in the form of selected section of roads and crossroads. Every area was evaluated and compared in terms of accident rate.
925

Měřicí hřebenová trychtýřová anténa / Double ridge horn antenna for antenna measurement

Vašina, Petr January 2013 (has links)
The thesis deals with broadband antennas for measurement purposes. A ridged horn antenna has been selected for this concept, designed for the frequency range 0.9 GHz to 9 GHz. This work contains general theoretical description of antennas and further it focuses on a specific design of the ridged horn antenna, beginning with the calculation of its dimensions, modeling and optimization to obtain desired antenna properties. Finally, the antenna was constructed and measured. The reflection factor s11
926

Most přes Lochkovské údolí / Bridge across the Lochkov Valley

Zvolánek, Lukáš January 2013 (has links)
The theme of the Master’s thesis is detailed design of superstructure for selected option of the bridge. The bridge carries highway across Lochkov valley. The superstructure, 6 spans, is made of one cell continuous box beam with large overhangs supported by prefabricated struts. The continuous beam is in plan curvature. As the first, side spans 1, 5, 6 will be casting on fixed scaffolding. Spans 2 and 4 will be casting using cantilever method, gradually hanging superstructure up. For the casting the main span will also be using cantilever method, gradually removing temporary hangers of adjacent spans. The structure was analysed according to limit states. The thesis also includes a time dependent analysis of the structure and solution of influence construction on its design.
927

Lávka přes řeku Úpu v Trutnově / Footbridge over Úpa river in Trutnov

Výborný, Martin January 2015 (has links)
The goal of this thesis was to design a steel structure of a footbridge for pedestrians and cyclists over the river Úpa in Trutnov spanning 20m. Also, it was calculated with a crossing of 3,5t vehicle. Preliminary design was carried for two variants. Variant B is truss structure, structure of Variant A is carried by prestressed cable and is further developed. Main structural beams of variant A are designed to be a shape of parabole with the middle beam connected by arbitrary profiled vertical beams to supporting prestressed high yield cable. For the design of structure, SLS was the main factor so elastic check is performed for ULS.
928

Čtyřdobý motor pro malou mechanizaci / 4-stroke Engine for Small Mechanization

Kuchař, Patrik January 2008 (has links)
The diploma thesis deals with a proposal of the four - stroke gas engine. There are mentioned the basic draft calculations of a crank mechanism and overhead valves. Further deals with a strenght calculation of the engine piston and analysis state of stress of the engine piston by the help of Finite Element Metod.
929

Kriteria vzniku defektů při ohybu profilových trubek / Conditions of failures generation when bending profiled tubes

Fišar, Luboš January 2011 (has links)
The thesis describes the knowledge from a round tube bending technology, as a description of conventional and unconventional devices. There are technological parameters in relation to the creation of defects, and equations for determining the bending moment. These knowledge has been generalized and applied to solution the changes of cross-section shape and thickness in the bending of square cross-section. The solution was implemented to specific component (20x2 mm steel tube with two successive radii R57,2 and R131,5). The results of experiments shows that the material is almost rigid-perfectly plastic, in the most stressed areas has a sufficient supply of material formability. Thickness measurement was applied to calculate the approximate center of gravity changes. This shows a shift of 1.4 mm, which is negligible value for the pure bending. The end of the thesis summarizes the deficiencies of current manufacturing technology, which used mandrel is inadequate, wrong located and poor lubrication.
930

Modernizace ST-NT dílu parní turbiny 300 MW / Retrofit IP-LP Section Steam Turbine 300MW

Pavlik, Richard January 2014 (has links)
The aim of this master’s thesis is a retrofit of condensing three case steam turbine K300-170 with reheating. In the first part, the heat balance of the system is calculated for given parameters. The design of the flow section is focused on the combined intermediate pressure and low pressure turbine section and it consists of defining rotor and blading characteristics. In the stress control, the stress of the designed blading is checked and for the conclusion the shaft seal losses and their effect on the overall output power of the turbine are estimated. The drawing of axial section of combined intermediate pressure and low pressure turbine section is also included in the thesis.

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