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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.
221

Návrh výměníku tepla / Design of heat exchanger

Klučka, Ivan January 2014 (has links)
This thesis is focused on the thermal-hydraulic and construction design of heat exchanger with floating head. The introductory part is dedicated to the design of heat exchangers. Next part is focused on the thermal-hydraulic design created in HTRI software (module Xist. The next section is the strength calculation of selected components of the heat exchanger according to EN 13445 in software Sant'Ambrogio. The following part describes each of the analysis in software Ansys Workbench. The final part contains complete manufacturing documentation of heat exchanger.
222

Dynamická charakteristika zpětné armatury / The dynamic characteristics of check valve

Pavlík, Václav January 2016 (has links)
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.
223

Založení výškové budovy / Foundation of tall buildings

Kubínek, Michal January 2017 (has links)
The diploma thesis describes design and assessment of foundation of tall building. Existing reinforced concrete slab-pile foundation structure was assessed as unsatisfactory at the ultimate limit state. Design of two new options was processed: slab-pile foundation with adjusted slab thickness and slab foundation without piles. Both options were assessed at the ultimate limit state and the serviceability limit state. Foundation options were designed as water-impermeable structure of white tank and meet requirements for this type of structures.
224

Teplotně vlhkostní namáhaní stěny dřevostavby / Hygrothermal processes in walls of wooden houses

Vencel, Lukáš January 2017 (has links)
This diploma thesis solves the problems of hydrothermal processes in walls of wooden houses and associated issues. A chosen were two apartment buildings, where they underwent exmerimental measurement of indor air, in order to determine the boundary conditions commonly boundary building evelope. Was followed by hygrothermal analysis of four commonly used constructions of wooden buildings in the Czech Republic, using various numerical methods. The quantity of information obtained from various numerical methods were analyzed individually. The final part of the thesis is devoted to experimental measurements of diffusion properties of materials. Namely foil vapor barrier, in terms of its influence on the perforation vapor diffusion resistance factor. Information obtained from the experiments were applied to re numerical analysis for walls with a foil vapor barrier. Followed by comparing both cases, in terms of changes hygrothermal behavior of structures with influence of perforation of the vapor barrier.
225

Tribuna fotbalového stadionu / Tribune of football stadium

Weber, Jozef January 2017 (has links)
The aim of the diploma thesis was to design the precast reinforced concrete prefabricated structures of the football tribune. It was modernized sports center in Brno. According to the investor was determined the shape of the football tribune. It was compiled the design documentation. For the calculation of inner strengths was used the software Dlubal RFEM, which operates on the Finite Element Method - FEM. All elements have been designed for ultimate and serviceability limit state. My thesis contains textual part, inner strengths, static calculations, drawing documentation of composition of structure, drawing documentation of reinforcement and design documentation of the object.
226

Úloha adrenergního systému v genetické hypertenzi / The role of adrenergic system in genetic hypertension

Loučková, Anna January 2013 (has links)
The adrenergic system plays an important role in the regulation of blood pressure. In the spontaneously hypertensive rat, the most studied model of essential hypertension, many components of the adrenergic system are altered. Changes in expression level of any catecholamine biosynthetic enzymes or any adrenergic receptor subtypes could be one of the causes of hypertension development. In this work, the expression of adrenergic system genes was measured in adrenal gland, renal cortex and renal medulla of the spontaneously hypertensive (SHR), Wistar-Kyoto and Brown Norway rats at the age of thirteen weeks. In adrenal gland of SHR, all four catecholamine biosynthetic enzymes (tyrosine hydroxylase, DOPA decarboxylase, dopamine β-hydroxylase and phenylethanolamine-N- methyltransferase) and almost all subtypes of adrenergic receptors (with the exception of Adra1a and Adra1d) were underexpressed. This generally decreased expression in adrenal gland of SHR suggests that at least a part of regulation of adrenergic system gene expression is common. The mechanism of this downregulation in SHR could be a negative feedback through adrenergic receptors stimulated by high plasma noradrenaline concentration. In the kidney of SHR, there were no differences in the expression of most of adrenergic receptor subtypes with the...
227

Analýza kauzálního vztahu mezi kardiovaskulárními signály / Causal interaction analysis of cardiovascular signals

Tiurina, Mariia January 2019 (has links)
Application of the non-invasive methods to detection of the baroreflex sensitivity is a correct way to evaluate the functions of cardiovascular system. This master’s thesis describes the theoretical informations about the problem of baroreflex sensitivity from anatomical, patalogical and clinical views. Theoretical knowledges are foundation for mathematical description of some methods to detection of baroreflx sensitivity in time, frequency and information dimensions. In the practical part of the master’s theses are presented two methods of BRS detection – sequence method based on finding the specific sequences of time series signals and method of application bivariante autoregressive model. Both of methods are implemented in MATLAB. The results of testing data on real data are discussed.
228

Pulsace toku kapaliny v pružné trubici / Pulse flow of liquid in flexible tube

Komoráš, Miroslav January 2019 (has links)
This master’s thesis is dealing with analysis of fluid flow pulse in a flexible tube representing e.g. an artery in a human body. In ANSYS program, 3D simulations were performed, and these are so-called interrelated FSI analysis. In Maple software, 1D simulations of fluid flow in the tube were performed for various thin-walled and thick-walled variants. The aim is using these programs to determine the flow rates and pressures in the tube, its wall deformation and stress. Therefore, the theoretical part deals mainly with basic equations of flow dynamics, linear and nonlinear models and rotationally symmetric vessels. In the computational part are described individual procedures in the mentioned programs.
229

Vyhodnocení rychlosti šíření tlakové vlny v lidském těle / Evaluation of pulse wave velocity in the human body

Mezuláníková, Radka January 2013 (has links)
This Mater's thesis deals with the evaluation of pulse wave velocity using multi-channel whole-body impedance cardiography. Data were taken from the group of healthy volunteers whose impedance changes were measured during rest, respiratory maneuvers, tilt and stress exercise. The result of this measurement are values of peaks of pulse wave time shifts towards R-wave. The velocity values towards the thorax electrodes were recalculated on the basis of knowledge about the pulse wave time shifts and the distances from the heart to the scanned locations, which were measured using the arterial segment's lengths.
230

Městský okruh Blanka, tunel Královská obora - ražená část, stavebně technologická příprava stavby / City circle road Blanka, tunnel Královská obora - mined section, preparation and building construction technology

Kobielusz, Petr January 2013 (has links)
My thesis is focused on process preparation and building construction technology of primary lining road tunnel, implemented in city part of Troja in the capital city Prague. Specifically it is a part of tunnel complex Blanka. The name of this part is Kralovská obora. If the all tunnel parts are built this tunnel complex Blanka can be complemented to already opened tunnels Zlíchovský, Mrázovka and Strahovský which are the part of city traffic circle. This technology preparation includes schedules and financial plans of the building, technological prescription for the primary tunnel lining, safety plan, control and trial/test plans, environmental plan, project of construction site, design of the main working machines, items budget of the north tunnel tube, coordination situation plan with wider relationships transport routes and technical report of building technological project.

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