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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.
411

Vliv etherů celulózy na reologické vlastnosti vápna / Influence of cellulose ethers on rheological properties of lime

Hegrová, Michaela January 2018 (has links)
The subject of this diploma thesis is a study of the influence of cellulose ethers on the rheological properties of lime. The theoretical part focuses on rheological parameters, techniques and test equipment used in rheology measurements. Various types of cellulose ethers and their influence on the rheological properties of fresh mortars are described. The practical part deals with the study of the influence of different types and quantities of cellulose ethers on the properties of fresh lime pastes and mortars. The results were obtained from measurements on a rotational rheometer with a special geometry for building materials. Measuring methods used were flow and oscillatory tests. Yield stress, viscosity and flow index were determined by the flow measurement. The stability and stiffness of fresh materials were determined during the oscillation measurements. The measured results are then evaluated and compared.
412

Malé tepelné čerpadlo poháněné plynovým spalovacím motorem / Small-scale gas heat pump

Poul, Josef January 2018 (has links)
The diploma thesis deals with the issue of gas heat pumps. It provides a general survey of heat pumps in the first part and in the second part it aims on proposing settings of a gas heat pump for the given operating parameters. The proposed concept is applied to the specific case study of deployment in the industry with subsequent economic evaluation.
413

Analýza tržní ceny nemovitostí v příhraničních regionech / Analysis of the real estate market price in border regions

Chromčáková, Marcela January 2020 (has links)
The goal of my research and study is to analyze market prices of the real estate properties on the borders of the Czech Republic, Slovakia and Austria. Based on the collection of the needed data, there are databases made in which the real estates are categorized by the type, disposition and location. According to the database, we can then calculate the average market prices of the real estate properties which we can later compare to the border regions' standards. Likewise, we also consider the specific structure of the database in the outputs, which helps us to outline the different factors influencing the property price. Special attention is paid to those factors which play a big part in the real estate prices. Likewise, we considered the other factors increasing the property market price in the study.
414

Studie proveditelnosti multifunkčního objektu v Humpolci / Stable feasibility of a multifunctional building in Humpolec

Kulík, Matěj January 2020 (has links)
The aim of the thesis is to prepare a feasibility study of a multifunctional house in Humpolec and to evaluate the profitability of the project in the first 30 years of its operation. The evaluation of the project includes an initial financial analysis and two other possible situations. The theoretical part defines the basic information about the division of construction contract, the process of preparation and implementation of the project, types of financing investment projects, economic indicators and analyzes. In the practical part are given basic information multifunctional object. This is the site of construction, the character of the proposed building, including its planned use, financing and the three types of scenarios already mentioned. This is the baseline scenario, the optimistic scenario and the pessimistic scenario. At the end of the thesis there will be evaluated all investigated situations.
415

Parní turbína - návrh potrubní trasy kondenzátu / Steam turbine - pipeline design

Kotas, Jakub January 2020 (has links)
The master thesis deals with the design, tracing and dimensioning of condensate pipeline. In the beginning, a preliminary calculation of heat balance is done. It is followed by a description of the main condensate system supplemented by the computational design of pipeline and the calculation of pressure losses in this pipeline. The crucial part of the thesis is the calculation of pressure losses, which is done in two ways. The first approach to calculation of pressure losses in the pipeline is calculated using values of representative resistance coefficient for pipe ele-ments using Idelchik literature and for individual types of valves using values from datasheets of Siemens Energy suppliers. In the second approach to calculation representative resistance coefficients for pipe elements and individual types of valves CRANE literature are used. Then both approaches of choosing representative resistance coefficients are compared and evaluated. Based on the calculated values, a suitable pump is selected at the end of the master thesis.
416

Porovnání metod pro identifikaci poruch valivých ložisek / Comparison of methods for identification of rolling bearing failures

Kokeš, Miroslav January 2021 (has links)
The aim of this master thesis is the comparison of selected methods and parameters for roller bearings diagnostics. Selected statistical parameters are kurtosis, crest factor, and parameter K(t). The other selected methods are envelope analysis, cepstral analysis, and ACEP method. These methods are implemented in LabVIEW software and compared based on noise resistance, computation speed, and overall capability of identifying roller bearing faults.
417

Výpočetní analýza čtyř-koulového testu pro určování pevnosti keramických laminátů se zbytkovou napjatostí / Computational analysis of the ball-on-three-balls test for determination of strength of ceramic laminates with residual stresses

Venský, Jiří January 2021 (has links)
Tato diplomová práce se zabývá numerickou simulací B3B zkoušky. Byla provedena rešerše v souvisejících oblastech. Poté byly provedeny numerické simulace této zkoušky pro mnoho různých konfigurací (rovný, zakřivený a zakřivený vrstvený vzorek) pro disk a desku. Byla zjištěna hyperbolická závislost mezi tloušťkou a f faktorem. Závislost f faktoru na křivosti byla lineární. Byla provedena demonstrace možnosti prasknutí na rozhraní vrstev. Poslední část ukázala, jak by zanedbání vlivu zbytkového napětí mohlo vést ke špatnému vyhodnocování experimentů
418

Výskyt těžkých kovů v okolí pozemní komunikace Rudná / Presence of heavy metals near the way Rudná

Chovanec, Petr January 2011 (has links)
These diploma thesis is focused on assessment of hazardous metals in soils near the road Rudná in Ostrava. Seventeen sampling sites have been chosen along this road, samples from this sites were collected in three series. The amounts of mercury, lead, copper, cadmium, zinc, vanadium and manganese were determined. There was also assessed contamination of selected sites using contamination factor and degree of contamination.
419

Nízkošumový zesilovač pro pásmo S / Low-noise S-band amplifier

Potěšil, Dušan January 2008 (has links)
This work deals with design, simulation and realisation of a receiving systém of an S-band front end for satellite communication. The first part of the project is designed the low noise amplifier (LNA) with high associated gain. The basic point of the design is choice of the active device. In the present time are available the ultra low noise transistors based on the GaAs with high mobility electron. The two-stage LNA has been designed with Agilent ATF-55143. It is pseudomorphic HEMTs ,which work in an enhancement mode.These transistor do not require a negative bias voltage and have extremely good typical noise figure. The design includes an interdigital tuned band pass filter between stages. The second part of the project is search another way design circuit. There are designed two LNA with paralel coupled line filter. The first has been applied on a PTFE substrate Duroid 5880 with relative permitivity 2,2 and tg d = 0,009. The substrate FR-4 (r = 4.34) with the thickness 0.06” was used for the realization.
420

Posouzení vlivu jednotlivých druhů OZE na elektrizační soustavu / Assessment of the impact of different types of RES in the power system

Zmeškal, Pavel January 2011 (has links)
This thesis deals with usage of each kind of RES under conditions of Czech republic and their usage at areas placed in. Consequently supplied RES output power at time and its influence on reliability of supply in EPS CZ. Way of operation of RES from point of view of requirement on regulation and control of operation of EPS is more studied on operation of different kinds of wind power plants, which due to its variable output power affects not only EPS CZ. At final caption, economic influence of RES to EPS is reviewed as a unit, increasingly claims on regulation, increasingly benefit on support of RES. All these influences increase price of electricity for end user.

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