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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.
351

Most přes řeku Jevišovku / Bridge over the Jevišovka river

Čípek, Luboš January 2019 (has links)
This thesis focuses on design and assessment of load-bearing construction of a bridge over Jevišovka river at road I/53 near Lechovice. The bridge was designed as a trapezoidal cross-section slab. This solution was chosen from three sketch eventualities. The work includes an implementing engineering report, construction process report and report about static-analysis, the attachments include the sketch, vizualization, drawings, component drawing, construction process and the static-analysis of this structure. Computing of internal forces was performed by computational software Scia Engineer 17.
352

Návrh testovacího stavu diferenciálu pro zástavbu v bezdozvukové komoře / Design of the Differential Test Rig for Testing in Anechoic Chamber

Ivanič, Michal January 2020 (has links)
The diploma thesis describes the design of a test stand for experimental determination of vibroacoustic parameters of a part of the powertrain system. Thesis contains a research part, describing the problems of the drive system, vibroacoustics, measuring devices and also the division and the description of test stands. At the same time, the reasons for choosing a closed loop test stand are explained. Thesis also includes the results of analytical calculations and numerical results of FEM methods performed using ANSYS software, as well as drawing documentation of individual parts.
353

Metabolická a biofyzikální charakterizace bakteriálních buněk schopných akumulace PHA / Metabolic and biophysical characterization of bacterial cells capable of PHA accumulation

Slaninová, Eva January 2021 (has links)
This thesis deals with the characterization of bacterial cells capable of polyhydroxyalkanoates (PHA) accumulation. The dissertation thesis is written in the form of a discussed published publications which are attached to the thesis as appendixes. The work develops a study of the current topic of the protective functions of PHA and clarifies protective mechanisms against selected stressors. Firstly, we focused on the protective effects of PHA granules against UV radiation and osmotic stress, specifically hypotonic conditions. In the case of UV exposition, the cells protected themselves by scattering UV radiation on the intracellular granules protecting especially nucleoid. When exposed to osmotic stress, the amorphous state of PHA granules is very important since it is capable of stabilization of cell membranes under hypertonic stress, afterwards, bacterial cells can maintain their integrity during the subsequent hypotonic challenge. In general, the amorphous state of PHA granules is key to ensure the proper biological functions of PHA whether as storage or protective polymer. Therefore, in the next part of this work, we focused on the core of the stabilization mechanism that protects native PHA granules from crystallization and thus the intracellular polymer maintains in a thermodynamically unfavorable amorphous phase state. Based on experimental work, we applied selected stresses because we proposed a new model of stabilization of the amorphous state of PHA granules in vivo. It consists of two mechanisms, where small volumes of PHA granules reduce the rates of crystallization and at the same time the water present in the granules plays the role of a low molecular plasticizer. Due to the metabolic apparatus of bacterial cells, PHA are simultaneously synthesized and degraded which leads to an increment of intracellular concentration of monomers that also figure in the protective effect of PHA. In this context, we aimed at the description of the mechanism of cryoprotective effects of 3-hydroxybutyrate, the monomer of the most common of PHA, poly(3-hydroxybutyrate). Hence, we constructed an equilibrium and non-equilibrium phase diagram of the 3HB-water system to prove that 3HB is a very effective cryoprotectant. This fundamental understanding of the protective properties of PHA monomers could be also used in the food industry or cryopreservation of biological samples.
354

Zpracování dat provozního zatížení pro zkoušky na elektrodynamickém zkušebním stavu / Processing of Operating Load Data for Electrodynamic Test Bench

Prouza, Jiří January 2021 (has links)
This master's thesis deals with data processing for an electrodynamic test bench. The thesis presents a theoretical overview of signal distribution, determination of fatigue damage from random vibrations and a description of test benches. The next part deals with setting up the test time reduction in GlyphWorks software. The aim of this thesis is to process and create a procedure for an accelerated fatigue test from data measured during an operational test on a polygon. The data are then verified on an electrodynamic test rig using a Skoda Auto dynamic test room. The final part of the thesis contains data evaluation and a guide explaining how to easily create a test in the relevant software.
355

Analýza řadicího mechanizmu traktoru / Tractor Shift Mechanism Analysis

Netopil, Jan January 2021 (has links)
The thesis focuses on the shifting mechanisms of manually shifted tractor transmissions. It provides a comprehensive overview of all significant structural nodes of the shift mechanism with an analysis of the influence of the structure on the resulting intensity of a force required for shifting. The main aim of this thesis is the design and validation of experimental equipment for measuring the force effects of the shift mechanism of a mass-produced tractor in actual operation. The design of the experimental equipment is based on a study of the used measuring technique and similar experimental equipment. The final structure is selected based on selection by the method of weighted values, taking into consideration the requirements of the structure. A functional measuring chain is designed and formed for the realization of the measurement. To evaluate the data from the technical experiment, a multibody model of the designed experimental device is created in the MSC Adams View software, through which the real parameters of the shift mechanism are obtained from the measured values. The designed experimental equipment brings the possibility of complete analysis and subsequent optimization of the tractor's shift mechanism
356

Zkoumání příčin předčasné ztráty kapacity v olověných akumulátorech pro hybridní elektrická vozidla / Investigation causes of the premature capacity loss in accumulator for hybrid electric vehicles

Vystrčil, Marek January 2010 (has links)
This thesis describes the results of two successive experiments. The first was focused on the influence of impurities in the active mass of negative electrode in PSoC (Partial State of Charge) mode, which simulates the conditions occurring in HEV (hybrid electric vehicle). In the second experiment, cells with the same additives were exposed to optimum downforce 4N/cm2, by which we wanted to prove the influence of pressure on life of VRLA (Valve Regulated Lead Acid) cells working in operating HEV conditions.
357

Vliv přítlaku v olověných akumulátorech pro hybridní elektrická vozidla / Influence of pressure in the lead-acid batteries for hybrid electric vehicles.

Svoboda, Marek January 2011 (has links)
Lead-acid batteries of hybrid electric vehicles (HEV) are functioning in PSoC regime (Partial State of Charge). In PSoC regime new fail mechanisms occur. These mechanisms usually lead to nonreversible sulphation of negative electrodes. Main aim of this research is to avoid negative electrode sulphation and to improve lifetime of lead-acid accumulators used in HEV.
358

Hodnocení aktuálního stavebně technického stavu existujícího objektu / Current evaluation of technical conditions existing building

Kopečková, Hana January 2014 (has links)
This thesis deals about the methodology, implementation and evaluation of diagnostic work of units and structural elements of the residental building built on Gorkého street in Brno. The building is located in the premesis of the vicinity of The Faculty of Arts, where was the extensive reconstruction and also the final extension. The survey was conducted for this reason . The experimantal part of the thesis include a static assessment of the mansory wall.
359

Most přes údolí potoka Kyselá voda / Bridge over the Kyselá voda brook valley

Svoboda, Tomáš January 2015 (has links)
The subject of the diploma thesis is the design of the ghrinder bridge over the Kyselá voda brook valley. The main topic is static calculation of supporting construction of six span structure. Two studies were executed and the second option, pre-stressed girder bridge was chosen. The lenght of the spans is 27 + 6 x 35 + 27 m. Static model and effect of loading are solved in software Scia Engineer. Reviews are calculated by hand according to current standards.
360

Návrh a posouzení ŽB skeletu / Design and review of RC structure.

Hečková, Beata January 2015 (has links)
This diploma thesis deal with of the design of selected parts of a monolithic reinforced concrete building. Static solution includes an assessment of slab in local supports, calculation of columns, beam, stair and footing. The building will be used as an multifunctional building. In this thesis was developed a static calculation, reinforcement drawings and shape drawings.

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