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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.
11

Měření parametrů polarizovaného světla na výstupu optovláknového senzoru / Measurement of polarized lightparametrs measurement on the optical-fiber sensor output

Drábek, Jakub January 2018 (has links)
This master's thesis deals with the analysis of the optical power measurement using an optical fiber sensor. The thesis contains the theoretical background to understand the origin of polarization and its representation in space using Poincaré’s sphere and Stokes vectors. There is also a part describing optical performance measurement and the preview of analog measurements from various researches. Practical part focuses on verification of changes of fiber sensor parameters at temperature change in its surroundings and this part includes also additional suggestions for various types of measurements and verification of the function of the photodiode as an optical power transducer. Most measurements are based on the comparison of results obtained with the polarimeter. The results were plotted and discussed.
12

Studium parciálního skluzu v kapalinách s využitím vysokofrekvenčních střižných kmitů / Partial slip in liquids studied with high-frequency shear oscillations

Vlachová, Jana January 2014 (has links)
Byl studován kontakt mezi koulí a deskou pod tangenciálním zatížením ve vodě. Jako zdroj střižných kmitů byl použit akustický rezonátor (křemíkové mikrováhy – QCM). Kontakt koule s povrchem resonátoru indukuje změnu resonanční frekvence a šířky pásma. Byla měřena změna frekvence f a změna šířky pásma v závislosti na amplitudě oscilací. S rostoucí amplitudou docházelo k poklesu f a růstem , což je chování typické pro parciální skluz. Díky aplikaci Cattaneo-Mindlinova modelu byl vypočítán kontaktní poloměr a třecí koeficient. Kontaktní poloměr při nízké amplitudě stoupal při zvětšujícím se normálovým zatížením. Tato závislost se dobře shodovala s JKR modelem. Třecí koeficient se nacházel v odpovídajícím rozsahu. Při zvyšování externí normálové síly, docházelo k nepatrnému snižování hodnoty třecího koeficientu. Toto chování je vysvětleno příspěvkem adhezivních sil k totální normálové síle. Výpočtem byly získány dva typy třecích koeficientů, první ze změny frekvence f a druhý ze změny šířky pásma . Tyto dvě hodnoty se spolu shodovaly z ± 20 % pro měření prováděná ve vodě, zatímco pro dvě měření prováděných na hydrofilním povrchu ve vzduchu se lišila. Tento nesoulad poukazuje na nedostatek Cattaneo Mindlinovy teorie a mohl by být vysvětlen přítomností kapilárních sil.
13

Vizuální detekce herního stavu biliardu / Detection of billiard's situation by means of camera

Zítka, Michal January 2010 (has links)
This thesis deals with processing pictures from game on billiard, their pre-processing, segmentation and classification of objects. Depending on objects classification is determinated state of game and it´s next step. Aim of this project is development of system for gameplay assistance.
14

Diskrétní modelování štěrku pro železniční svršek / Discrete modelling of railway ballast

Dubina, Radek January 2014 (has links)
For modeling of particulate materials, discrete element method (DEM) is commonly used. It perceives every particle like a single body. A railway ballast loading by trains is a typical example of a particulate discrete material. By a passing train, static and dynamic forces act on a track bed. Cycling loading results in pernament changes in the railway ballast. Cavity creation, agglomeration and ballast cracking lead to damages in rail traffic. Usage of the discrete element method may reveal the real issues of the railway ballast and it may leads to a reduction of costs associated with a design and repairs. This thesis is focused on the ballast modeling and identification of the discrete model parameters. Obtained results are compared with real experiments from Nottingham University.
15

Přepočet a variantní návrh zastřešení zimního stadiónu ve Znojmě / Static verification and variant design of roof structure of winter sport stadium in Znojmo city

Kovář, Jindřich January 2014 (has links)
The subject of the thesis is the conversion and alternative proposals for the existing steel structure roofing winter stadium in Znojmo. The building has a rectangular shape with dimensions of 84 x 63 m Roof truss structure is formed purlins and trusses girlandovými, vynášenými two steel arches with a span of 84 m variant solution is full board and reduced lattice truss plate. After evaluating both solutions was chosen the first option, which was subsequently designed and assessed according to applicable standards. Truss plate is designed on the original footprint supported the original concrete bearing walls. Eye lattice plate is a square with sides of length 3.5 mA at 3 m Joints are designed truss balls and anchoring pin.
16

Libeňský plynojem v českém moderním umění / Libeň Gasholder within the Czech Modern Art

Kudličková, Anita January 2020 (has links)
The master thesis is called Libeň Gasholder within the Czech Modern Art. The diplomate will work out a study of importance and meanings of Libeň gasholder within the iconography of the Czech modern art. The first part will expose the gasholder itself, its creation and its later life when it did not serve its original function any more, and will define the shifts of context in the perception of the gasholder as a part of the city. She will first briefly describe how Libeň transformed into an industrial city. The brief outline of the technology of gas production, transport and storage in the following part will clarify what determines the shape of the structure and will provide its basic typology. An independent chapter will deal with absolute forms in architecture and various meanings of sphere in the visual culture. The issues of transitions of things outside the artistic world into artistic ones will first be addressed by the depiction of Libeň gasholder in literature. The core of the thesis will lay in an analysis of a concentrated and typologically sorted art material. Based on that, the thesis will conclude with a clarification and summary of meanings ascribed to Libeň gasholder image in the context of Czech art. An image documentation will be attached to the thesis.
17

ROLE NEINSTITUCIONALIZOVANÉHO SOUKROMÉHO KAPITÁLU V PODMÍNKÁCH NOVĚ ZAKLÁDANÝCH PODNIKŮ A JEJICH ROZVOJOVÝCH FÁZÍ / NON-INSTITUTIONAL PRIVATE EQUITY AS INVESTMENTS IN START-UPS AND EXPANSION-STAGE ENTERPRISES

Skalická, Martina January 2018 (has links)
This Ph.D. thesis examines characteristics of Business Angel investors in the Czech Republic and their attitudes to evaluation of investment projects. The research is based on primary data obtained by interviewing active Business Angel investors operating in the Czech Republic. The characteristics of Business Angel investors and their attitudes in investment decision making and subsequent monitoring of investments are analysed. Business Angel investors were also asked how they perceive external environment. The topics and questions listed in the interviews result from a systematic literature review. Based on the results of the interviews, an elimination model was developed to capture the preferences of individual Business Angel investors. The model represents a tool supporting entrepreneurs while determining the probability that their project will not be rejected without a deeper examination. Therefore, the model supports entrepreneurs to set the parameters of their projects to increase the likelihood that a Business Angel investor will undergo a detailed due diligence process.
18

Použití Riemannova integrálu k výpočtu matematicko-fyzikálních úloh / Using of the Riemannian integral for mathematical and physical calculus

MAREČEK, Ondřej January 2008 (has links)
The theoretical part of the thesis includes introduction of Riemann integral and its qualities, introduction of function of more variables, introduction of double and triple Riemann integral and physical applications of integral. The practical part includes derivation of general area formulas for different shapes and volume formulas for different solids, in some examples there are shown different ways of solution. The practical part also includes the use of Riemann integral for the determination of centre of mass, of statical moments and moments of inertia of objects.
19

Multifunkční objekt v Českých Budějovicích / The Multipurpose House in České Budějovice

Špačková, Eva January 2016 (has links)
The subject of this thesis is the design and assessment of the supporting structure multifunctional building in the Czech Budejovice . The construction of a sphere with a maximum diameter of 30 m and a height of 19.5 meters the highest point . The supporting structure consists of curved ribs , elevator shaft and ceiling beams . The structure is designed in 4 versions . Two variants are made of steel, the third option is wooden and the latest version solves a combination of wood and steel. In the variant selected is done loading , ultimate limit state, serviceability limit state , fire resistance and compounds selected details.
20

Promítání kamerou typu "rybí oko" / "Fisheye" Camera Projection

Macík, Pavel January 2008 (has links)
The thesis describes theoretical fundamentals of optics and problems of ray-tracing method, ray-triangle intersection computation included. Next section describes concept of three different camera models for ray-tracing method - plain camera, pinehole camea and spherical camera (fish-eye). The thesis comparse properties and capabilities of camera models and their effect to projected image of a scene. The program for raytracing was implemented for purposes of the thesis including implementation of camera models described in the thesis.

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