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Design of residential house
Moravcová, Eva ; Loudil, Lukáš (referee) ; Zich, Miloš (advisor)
This is a residential house in Brno. The supporting structure is reinforced concrete. The building has one basement and six floors. Vertical load-bearing structures are made up of reinforced concrete columns and walls. Horizontal load-bearing structures are formed by slabs (bearing in both directions). The staircase is concrete slab. Foundation is on piles. Infill vertical structures are brick. In the fifth floor pool is located.
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Measuring of height liquid level
Koksa, Martin ; Hůlka, Tomáš (referee) ; Němec, Zdeněk (advisor)
This bachelor‘s thesis seeks to clarify and describe modern methods of measuring a liquid level. The topic is discussed from several points of view, from which the emphasis was put on the division according to usage in hydropower. Moreover, this thesis portrays the fundamental principles of hydroelectric power plants and sensors used in them.
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Relevance of the hydrostatic and hydrodynamic paradox
Vacula, Jiří ; Haluza, Miloslav (referee) ; Fialová, Simona (advisor)
This bachelor’s thesis is concerned with the explanation of the hydrostatic and hydrodynamic paradox existence. Above all hydrostatic paradox is not in general properly explained which causes additional puzzle. Therefore the aim of this thesis is to find real reasons of these effects and in addition to check up possible consequences of liquid compressibility.
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Design of equipment for hydrostatic pressure monitoring
Zahrádka, Michal ; Bražina, Jakub (referee) ; Pruša, Radomír (advisor)
The purpose of bachelor thesis is the design and manufacture of a leveling electronic hydrostatic device. Part of the thesis is a research for current leveling equipment and pressure measurement methods with emphasis on the measurement of hydrostatic pressure. The entire device is to be implemented on the Arduino development platform. The use of the assembled meter is assumed in the construction industry.
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Structural changes in intermetallic compounds
Doležal, Petr ; Prchal, Jiří (advisor) ; Daniš, Stanislav (referee)
This diploma thesis is focused on the study of the structural phase transitions in intermetallic compounds LaPd2(Al,Ga)2 by low-temperature x-ray powder diffraction and macroscopic measurements on single crystals. The results obtained from powder diffraction at room temperature confirm that the compounds crystallize in tetragonal CaBe2Ge2 structure type (space group P4/nmm). At low temperature all the compounds undergo the same structural phase transition by lowering the symmetry to the orthorhombic space group Cmma. Although the structural transformation is of first order, the transition is not-manifested in step-like change of the phase at a certain temperature, but occurs in a broader temperature interval. In this interval the different phases coexist and transform gradually from high- to low- temperature phase. After application of hydrostatic pressure the structural transition is shifted to higher temperatures. Despite that the low temperature structures are of the same type, there is a difference between compounds containing Ga and Al in the discontinuity of the lattice parameters resulting in a distinct anomaly in electrical resistivity. In pressures >0.6 GPa this characteristic anomaly on single crystalline CePd2Al2 is changed, indicating a pressure- induced change of the low-temperature...
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New magnetic state of intermetallics - parimagnetism - in RCo2-type compound
Šebesta, Jakub ; Prchal, Jiří (advisor) ; Prokleška, Jan (referee)
A sample of TmCo2 compound was prepared and studied by means of temperature dependence of an electric resistivity, specific heat, magnetisation and AC magnetic susceptibility, all in ambient pressure. We have observed anomalies in the temperature dependence of specific heat at the temperatures TC Tm = (3,60 ± 0,05) K and TC Co = (4,6 ± 0,1) K, which are in the agreement with anomalies in the data of other physical variables. By comparison with HoCo2 and ErCo2 compounds, there was made a suggestion, that the characteristic temperatures correspond to the magnetic order of the Tm and Co sub-lattices. After that, temperature dependencies of AC magnetic susceptibility under external hydrostatic pressures up to 3 GPa were measured. We observed anomalies mentioned above in the measured data and moreover one more anomaly around 35 K. This anomaly corresponds most probably to the flipping temperature Tf of the magnetisation of Co clusters through the plain perpendicular to the magnetic moment of the nearest rare-earth atom. From the set of the realized pressure points we estimated pressure coefficients for the characteristic temperatures ∂TC Tm /∂p = (0,40±0,02) K·GPa-1 and ∂Tf/∂p ~ 0 K·GPa-1, . Roughly zero values of coefficients are significant, because of comparison with other RCo2-type compound.
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Pressure-induced changes of magnetic behavior of RCo2-type compounds
Valenta, Jaroslav ; Prchal, Jiří (advisor) ; Kamarád, Jiří (referee)
The diploma thesis is focused on the study of pressure-induced changes in a behavior of RECo2-type compounds. HoCo2 and its substitution of Si instead of Co in Ho(Co1-xSix)2, x = 0,025 were chosen as a representative compounds from this family of materials. Measurements of electric resistivity, heat capacity, magnetization and AC magnetic susceptibility under ambient pressure showed presence of three magnetic transitions for both samples: the change of the easy magnetization direction at TR ~ 16 K, the Curie temperature TC ~ 80 K and the flipping of magnetization of Co magnetic moments into the parallel direction with Ho magnetic moments at Tf ~ 125 K for HoCo2. Under hydrostatic pressures up to 3 GPa, the TR shifts to higher temperatures whereas TC and Tf, both decrease. This probably occurs due to the weakening of the Co magnetism and the strength of exchange interaction between Ho-Co sublattices. The experiment of muon spin rotation demonstrates a pressure influence to the decay of Co magnetic clusters, which occurs at lower temperatures with increasing pressure. It is evident that the hydrostatic pressure directly influences the exchange interaction between Co-Co.
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Influence of the external pressure on the magnetic behavior of the material
Valenta, Jaroslav ; Prchal, Jiří (advisor) ; Prokleška, Jan (referee)
This thesis deals with magnetic properties of the HoCo2 compound, which is composed of rare earth and transition metal elements. The study is focused on properties at ambient pressure and changes of the magnetic behavior of the material under hydrostatic pressure. At the ambient pressure, there was performed analysis of the sample quality with a finding of presence of three magnetic transitions: flipping temperature magnetization of Co clusters Tf = (125 ± 1) K, Curie temperature TC = (79,5 ± 0,1) K and spin-reorientation temperature TR = (16,4 ± 0,5) K. When applying the hydrostatic pressure up to 3 GPa, there was observed a shift of the temperatures of the magnetic transitions and in the case Tf and TR their consequent vanishing. From the shifts of the TC and Tf towards lower temperatures and from the vanishing of the Tf, it was concluded that Co magnetism is being suppressed by the influence of the hydrostatic pressure.
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Design of equipment for hydrostatic pressure monitoring
Zahrádka, Michal ; Bražina, Jakub (referee) ; Pruša, Radomír (advisor)
The purpose of bachelor thesis is the design and manufacture of a leveling electronic hydrostatic device. Part of the thesis is a research for current leveling equipment and pressure measurement methods with emphasis on the measurement of hydrostatic pressure. The entire device is to be implemented on the Arduino development platform. The use of the assembled meter is assumed in the construction industry.
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