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Substrate integrated phased antenna array
Liyambo, Evans ; Veselý, Jiří (referee) ; Raida, Zbyněk (advisor)
Tato semestrální práce se zabývá návrhem a ověřením fázované anténní řady integrované do substrátu pro kmitočtové pásmo Ka pomocí simulačního programu ANSYS HFSS. Anténní řada je buzena štěrbinou na horní stěně vlnovodu a fázována změnou vzdálenosti mezi deskou s vysokou permitivitou a štěrbinou na dolní stěně. Parametry antény jsou porovnány s parametry anténní řady navržené s prokovy vlnovodu nahrazené stěnami. Dále anténní řada integrována do substrátu se zvětšenými rozměry prokovů je navržená a simulována.
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Electronic tunable harmonic oscillator
Veselý, Jiří ; Jeřábek, Jan (referee) ; Šotner, Roman (advisor)
This masters project describes properties and primary parameters of active function blocks (OPA, VCA, OTA, CFA, CC) usable in construction of harmonic oscillators. Basic principles of harmonic generators, especially feedback oscillators, are introduced. In next section are presented five particular schematics of harmonic tuned oscillators. For this oscillators are indicated basic formulas, essential qualities performed by simulations and results of sensitivity and tolerance analysis. In the last part of diploma thesis there are selected three circuits which are made and their features are measured.
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Analysis of the Selected Company by Using the Selective Methods
Kouřil, Jakub ; Veselý, Jiří (referee) ; Hanušová, Helena (advisor)
Diplomová práce se zabývá komplexním zhodnocením aktuální situace podniku XXX s.r.o. První část práce teoreticky obsahuje jednotlivé analýzy, které jsou využity v analytické části. Analytická část práce zhodnocuje externí, sektorové a interní okolí firmy. Dále stručně analyzuje finanční zdraví podniku. Na základě provedených analýz s přihlédnutím na specifika podniku jsou formulována doporučení a opatření vedoucí ke zlepšení současné pozice na trhu.
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Optimal Domestic Investment Portfolio Proposal
Veselý, Jiří ; Wágnerová, Dagmar (referee) ; Škapa, Stanislav (advisor)
This bachelor´s thesis will be focused on the structure of investments made by two czech families. There will be also made an analysis of family income and outcome and its optimalisation. Counting will be on the base of financial mathematics. As outcome I can consider the summary of most riskful family market decisions and the proposal of its solutions where will be meant acceptable risk. The emphasis is placed on the structure of the final portfolio as well as on its dynamic devolopement in the course of time.
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Trigonometric and Fourier series and their applications
Sirotková, Veronika ; Slavík, Antonín (advisor) ; Veselý, Jiří (referee)
Fourier series are an important tool of mathematical analysis with many applicati- ons. This thesis focuses on their use in several specific mathematical problems. The first application is the proof of the isoperimetric inequality, according to which the circle has the greatest area among closed curves of a given length. Next topic is the sequence of fractional parts of numbers of the form nγ, where n runs through natural numbers and γ is an irrational number. The so-called equidistribution theorem holds for this sequence describing how this sequence fills the interval (0, 1). Fourier series are then also used to obtain a formula for calculating the sum of even powers of the reciprocals of natu- ral numbers. The last chapter is devoted to the Gauss circle problem, which investigates the estimation of the number of lattice points inside a circle of a given radius. 1
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Prostoročasy vytvářené elektromagnetickým polem a ideální tekutinou
Doleček, Vojtěch ; Žofka, Martin (advisor) ; Veselý, Jiří (referee)
This bachelor thesis deals with the search for sources of curvature of spacetime in general theory of relativity. In particular, it seeks to find a source of curvature that can be confidently said to be composed of a perfect fluid and an electromagnetic field. The problem of finding such physical solutions is first summarized in the first two chapters. Then, for specific spacetimes, it is already trying to find exact solutions that would correspond to such a source. 1
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Exact spacetimes and their physical properties
Veselý, Jiří ; Žofka, Martin (advisor) ; Hennigar, Robie (referee) ; Tahamtan, Tayebeh (referee)
Motivated by our desire to find generalizations of the Bonnor-Melvin spacetime, the thesis investigates seven static, cylindrically-symmetric and electrovacuum exact solutions to the Einstein-Maxwell equations. They contain a magnetic field and six of them also include the cosmological constant. After discussing some of the methods we use during our investigation, we present the basic properties of the spacetimes, and for each of them we also study charged test particle motion and their admissible shell sources composed of particle streams. We also perform numerical computations to determine whether the equations admit more general solutions than the exact ones we derived. 1
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