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Numerical simulation of incompressible fluid flow by the spectral element method
Pokorný, Jan ; Hlavička, Rudolf (referee) ; Čermák, Libor (advisor)
Tato diplomová práce prezentuje metodu spektrálních prvků. Tato metoda je použita k řešení stacionárního 2-D laminárního proudění Newtonovské nestlačitelné tekutiny. Proudění je popsáno stacionarní Navier-Stokesovou rovnicí. Dohromady s okrajovou pod- mínkou tvoří Navier-Stokesův problém. Na slabou formulaci této úlohy je aplikována metoda spektrálních prvků. Touto discretizací se získá soustava nelineárních rovnic. K obrdžení lineární soustavy je použita Newtonova iterační metoda. Podorobný algorit- mus tvoří jádro Navier-Stokeseva solveru, který je naprogramován v Matlabu. Na závěr jsou pomocí tohoto solveru řešeny dva příklady: proudění v kavitě a obtékání válce. Přík- lady jsou řešeny pro různé Reynoldsovy čísla. První od 1 do 1000 a druhý od 1 do 100.
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Multibosonové jevy na RHIC
Chaloupka, Petr
Au-Au collisions at RHIC energies exhibit features suggesting that the system has undergone evolution through a stage of partonic matter. The hot and dense system created in the collision builds up substantial collectivity leading to rapid transverse expansion. In particular recent measurements show that Ξ and Ω baryons develop substantial elliptic flow. Properties of the induced flow strongly depend on whether the collectivity is achieved on partonic or hadronic level. Multi-strange baryons may be, due to their presumably small hadronic cross- sections, mainly sensitive to the early (possibly partonic) stage. The main objective of this thesis is to study femtoscopic π−Ξ correlations in Au+Au collisions at √ sNN =200 GeV and √ sNN =62 GeV recorded by the STAR experiment at RHIC. Measurements of momentum correlations of particles at small relative velocities are used to extract information about space-time extension of the particle-emitting source at the time of kinetic freeze-out. Non-identical particle measurements are sensitive not only to the size of the system, but also to an emission asymmetry between different particle species. Since this asymmetry may arise from the collective expansion and/or early decoupling of Ξ these measurements of π−Ξ correlations provide important test of the dynamics of...
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Femtoscopy with multi-strange baryons at RHIC
Chaloupka, Petr ; Šumbera, Michal (advisor) ; Závada, Petr (referee) ; Staroba, Pavel (referee)
Au-Au collisions at RHIC energies exhibit features suggesting that the system has undergone evolution through a stage of partonic matter. The hot and dense system created in the collision builds up substantial collectivity leading to rapid transverse expansion. In particular recent measurements show that Ξ and Ω baryons develop substantial elliptic flow. Properties of the induced flow strongly depend on whether the collectivity is achieved on partonic or hadronic level. Multi-strange baryons may be, due to their presumably small hadronic cross- sections, mainly sensitive to the early (possibly partonic) stage. The main objective of this thesis is to study femtoscopic π−Ξ correlations in Au+Au collisions at √ sNN =200 GeV and √ sNN =62 GeV recorded by the STAR experiment at RHIC. Measurements of momentum correlations of particles at small relative velocities are used to extract information about space-time extension of the particle-emitting source at the time of kinetic freeze-out. Non-identical particle measurements are sensitive not only to the size of the system, but also to an emission asymmetry between different particle species. Since this asymmetry may arise from the collective expansion and/or early decoupling of Ξ these measurements of π−Ξ correlations provide important test of the dynamics of...
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"Everything's light and everything's upwards, the dance of elephants being uppermost". The metaphors of the movement in poetry of the poet Vladimir Holan.
Hudcová, Zuzana ; Heczková, Libuše (advisor) ; Wiendl, Jan (referee)
The purpose of the thesis is to deal with a writings of Vladimir Holan as a thematic unity, where the motifs are transformed. The metamorphosis depend on a time, when they have been written in. Our used method of his writings is in a chronological order. This thesis is focused on the motif of a movement and his metamorphosis in poetry of Vladimir Holan. The aim is to penetrate the problems of the movement as a physical activity and approached the movement as a confirmation of existence on a basis of Patočka's phenomenological phylosophy. Other chapters pay attention to analysis of motifs of movement, which are recognizable in Holan's poetry. Their feature change from lightness and freedom to heaviness and limitation. Afterwards the point of this work reaches the axis: a wind - a wave - a water flowed - a bird - a cloud - a stone - a snake - a wall. Due to the better understanding of Holan's work, we make a passing comment about the motifs which are connected with notised above. These connections will able to put our thoughts about Holan's conception in order.
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The Current Media Image of the Catholic Church in the Czech Lands
Švejda, Adam ; Poštulka, Filip (advisor) ; Havelka, Miloš (referee)
The aim of this thesis is to map the position of the Roman Catholic Church in our society and to elucidate the reasons for the Church's loss of ideological influence on the contemporary mainstream. This thesis investigates the interactions of the Church with the media from thefollowing perspectives: The use of media by the Church, the information flow from the Church towards our society and also the quality of the Church's image in the media. Further, this thesisexplains the final form of the social climate of our central-European civilization having the Roman Catholic Church as its background. Also, this thesis aims at clarifying the reasons for the media's tendency to reflect on the Church in particular, and on religion in general, in ahostile way. The contribution of this work is the explanation of the connection between the Church's loss of ideological influence and the loss of its position of power. This work investigates the historical and geopolitical connections with respect to the loss of the Church'spopularity and the number of believers. Further, this work searches for the specific features that distinguish the position of the Czech Catholic Church from the Catholic Church in the rest of the world. This thesis deals in detail with the issue of the Church's property restitution and...
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World's leading economic powers and their energy dependence
Vomáčková, Anna ; Vošta, Milan (advisor) ; Machytka, Daniel (referee)
The main subject of this paper is the disparity between the regions of production and consumption of energy in the world resulting in energy dependence. In the first chapter, the author characterises existing energy resources and their allocation in the world, then defines the notion of energy dependence itself. In the following four chapters, the focus is made on the four world's leading economic powers -- European Union, United States, Japan and China. These chapters analyse the main features of energy production and consumption as well as the major oil, natural gas and coal trade flows to the treated economies. Using the data, the paper draws the rate of energy dependence or vulnerability of these economies.
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Nutritional Support in Critically ill Patients
Suleiman Hussein, Nergis ; Těšínský, Pavel (advisor)
The purpose of this review is to discuss nutrition support in general with emphasis put on critically ill patients especially in regard to the metabolic changes. The physiologic consequences of the flow phase insult serve as the basis for modern critical care medicine in which key features such as support of adequate cardiac hemodynamics, optimized ventilation strategies, fluid administration, monitoring of organ function, and nutrition are supported in the critically ill patient.
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Mapping of biomass flows in a selected region using GIS
Stráník, Vojtěch ; Matějíček, Luboš (advisor) ; Brůna, Josef (referee)
This literal review provides a summary of available instruments used for plannig waste collection comming from urban green mainintence. At first it describes methods of remote sensing suitable for mapping urban green areas, then various technologies applied for estimation of biomass production at this places. Solutions of waste collection comes from several papers, that tried to solve this problem using geographic information system (GIS). The following chapter evaluates different features of this waste in purpose of its next use. The last part compares theoretical knowledge, with how it works in real life. Key words: urban green, remote sensing, geographic information system, waste collection
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The dynamic characteristics of check valve
Pavlík, Václav ; Dokoupil, Pavel (referee) ; Habán, Vladimír (advisor)
This master´s thesis provides an overview of all designs of check valves, their usage and typical features. Main purpose of this work is to clear up the phenomenon of check valve slam and the other problems that occur during transients. The check valve slam was measured at the test rig in the hydraulic laboratory. For unsteady flow evaluation after pump shut down was used Gibson method. The dynamic characteristic was possible to create by results from this method. It was achieved without impact of the speed of sound in the fluid. This work also contains 2D transient CFD calculations, which was used for evaluation of the hydrodynamic torque acting on the hinge pin. This approach provides an option to calculate wide range of cases at the expense of not entirely exact geometry. The main contribution of the theoretical study at the beginning of this thesis is its entireness. It might give an important clue when right valve is selecting. For good choice of valve might be helpful to use dynamic characteristics in this thesis presented. Mentioned characteristics were created by new way and its background is in measurements and simplified CFD calculations.
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