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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.
21

Využití kompozitních materiálů pro konstrukci sportovní optiky / Application of composite materials for sport optics

Kupčák, Radim January 2019 (has links)
In Its first half this master's thesis describes composite materials with carbon fiber reinforced plastics being the main focus point. An overview of production technologies follows. The major objective of the second part of this master's thesis is to design and manufacture a simplified model of an optical device using prepregs.
22

Marketingová strategie vybraného podniku / Marketing Strategy of the Selected Company

Šťastná, Klára January 2020 (has links)
This diploma thesis deals with the elaboration of proposals for the improvement of the marketing strategy for an optician brand named Valore. Following the theoretical background, this thesis analyzes the current state of the company and its marketing strategy. Based on the findings from the analysis of the internal and external environment of the brand, as well as from a questionnaire survey, specific and feasible suggestions for an improvement of the marketing strategy are created. The proposal part of the work is mainly focused on minimization and elimination of identified weaknesses while making use of strengths and opportunities of the brand. The marketing mix method was chosen to formulate suggestions for the marketing strategy adjustments. Suggestions contain a specific description of the recommended changes that will help to raise the company's awareness and bring in new clients. The proposals are mainly focused on the unification of the current online self-presentation, which is the company's greatest shortcoming. The suggestions include drafts for a redesign of the company's website as well as custom made way of communication on social networks. It also contain adjustments of the discount policy and the use of online customer registration, which is related to customer benefits and newsletters. The proposals were made in detail, including target groups and illustrative examples, so that it could be used by the company. The company is also recommended to employ an external online marketing specialist who will manage marketing communication according to proposals and his or hers own experience. Other suggestions include the modification of the assortment at the Gajdošova shop, so as to improve the identified customer dissatisfaction. A solution is also proposed for a detected problem with an employee in one of the stores, who the company should lay off and replace with a new employee. Among the proposals is also the use of the potential of the company's electric car, for which a design of an advertising sticker is prepared, which will create an affordable mobile outdoor commercial. To save unnecessary costs, it was also proposed to cancel the current advertisement in the BRNO-STŘED magazine, because the return of the costs proved to be almost zero amount.
23

Senzor vlnoplochy / Wavefront sensor

Škaroupka, David January 2020 (has links)
When the light passes through optical elements it can cause deformation of wavefront light due to the damage of materials and optical aberrations. The deformation leads to unprecise imaging and deformation of an image. The diploma work mentions wavefront sensing techniques which are important for determination inappropriate errors of optical elements and the specification of their properties. The purpose of the master's thesis is to suggest and investigate wavefront sensing methods after the light passes through the optical element while using the digital micromirror device. The work deals with the topic of wavefront aberrations and geometric optical defects of optical elements. Different kinds of commercial products determined for wavefront sensing are described too.
24

Návrh projektorové soustavy transmisního elektronového mikroskopu pro metodu Single Particle Analysis / Design of the Transmission Electron Microscope projection system for the Single Particle Analysis

Bačo, Ondřej January 2020 (has links)
Předkládaná práce se zabývá návrhem projektorové soustavy transmisního elektronového mikroskopu (TEM) pro metodu single particle analysis (SPA). Návrh projektorové soustavy byl vytvořen v programu Electron Optical Design (EOD) verze 4.020. Série buzení jednotlivých čoček pro zvětšení projektorové soustavy v rozsahu od 50 do 10000 byla vypočítaná pomocí přístupu využívajícího aproximaci tenké čočky, dále pomocí přístupu využívajícího aproximaci tlusté čočky, metodou linearního zaostření v programu EOD a metodou nelineárního zaostření v programu EOD ve verzi 5.003. Dosažené výsledky byly porovnány a ověřeny pomocí reálného trasování částic v programu EOD.
25

Čtecí zařízení mikroteček / Microdots scanner

Červinka, Luděk January 2008 (has links)
The microdots are very small object. The microdots are applied in protection object. The project purpose is to find and to analyze the microdots. The project consists from two parts. A first part describes the hardware sensor construction and a second part describes the software solution. I selected the optics, camera module and illumination in the hardware part. I’m analyzing of the microdots on a picture in software part.
26

Laserový vysílač s optickým vláknem / Laser transmitter with fiber

Hašek, Jaroslav January 2009 (has links)
This master´s thesis deals with communication which is provided by optical devices. Optical wireless links are enforced due to high bit rate, responsibility and noise immunity. Main part of this master´s project is devoted to optical fibre, its characteristic and its usage in laser transmitter.
27

Metodika měření optické páteřní sítě / Methodology for the measurement of optical arterial network

Chleboun, Jan January 2010 (has links)
There are methods to extend the transmission channel of optical transmission medium thanks to the development of telecommunications and informatics. Multiplex is a grouping of signals into a single transmission path and wave-division multiplexing is the best reason of use of the maximum fiber optic transmission capacity. The subject of this work is to determine whether a particular transmission path is suitable for such an extension of their capacity and how much. The answer is obtained by measuring the attenuation, the chromatic dispersion and the polarization mode dispersion, whose values are strictly limited and which determine next steps in the expansion of the transmission path, which is comprised by optical medium. Measurement methods determine the nature of the measured route and its current transmission capacities. Draft of the measurement methodology, which ensures the correct procedures during a possible transition to higher speeds is the output of this work. Thanks to the acquired characteristics of the BAPS (the Brno Academic Computer Network), the bit rate 40 Gb/s can be provided on this part of the network under the conditions of the introduction of certain countermeasures, particularly the exchange of a connectors on the measured optical lines. As for the back reflection lines in excess of the standard recommendation and pre-emptively on the lines with values with still agree with the return loss. Countermeasure for limiting of the chromatic and the polarization mode dispersion are do not need to stand in the way of a planned transition to a higher rate of the BAPS.
28

Bezkabelový optický přenos / Cableless optical transmission

Němec, David January 2012 (has links)
This diploma thesis first handles the general issues concerning free space optics in the atmosphere, which will then discuss the components and adjustments modification RONJA in laboratory. The aim is to simplify the control of laboratory FSO with programming compensation for HyperTerminal and provide external simulation influences on the FSO measurements in non-standard situations such as fog. It was created RONJA terminal with just cursor control to communicate with the serial port, ping, and FTP protocol. In the last part of this work were measured by an abnormal situation on the optical link RONJA.
29

Experimentální sady z optiky pro Interaktivní fyzikální laboratoř / Experimental sets in optics for Interactive Physics Laboratory

Machalická, Jana January 2017 (has links)
Title: Experimental sets in optics for Interactive Physics Laboratory Author: Jana Machalická Department: Department of Physics Education Supervisor: RNDr. Petr Kácovský, Ph.D., Department of Physics Education Abstract: As part of this thesis, a literature review focused on the topic of optics experiments was conducted. Building on the results of this review, four experimental stations were designed and realized based on the needs of the Interactive Physics Laboratory (IPL), operated by the Faculty of Mathematics and Physics, Charles University. Corresponding worksheets have also been created and provided to the students participating in each given experiment. The individual experiments, which are focused on the fields of geometrical and wave optics, are described in detail and accompanied by instructions on setting up the stations, as well as important notes on teaching methodology. Following the launch of this Optics experimental suite, a qualitative study exploring the effect of visiting the IPL on the understanding of the related physics concepts was performed by means of a short questionnaire on a small number of respondents. Several conclusions drawn from this study remain as interesting areas of future work. Keywords: physics experiments, labs, optics, secondary school
30

Studium změn ve spintonických strukturách vyvolaných femtosekunovými laserovými pulzy / Investigation of effects of femtosecond laser pulses on spintronic structures

Farkaš, Andrej January 2021 (has links)
This thesis is focused on a detailed investigation of the optically induced quench switching effect in different films of antiferromagnetic CuMnAs. The quench switching effect was recently discovered to be highly reproducible resistance switch- ing, which can be excited by electrical and optical laser pulses. This thesis com- pares the amplitude response to laser-induced quench switching for samples on the different substrate material, samples with different stoichiometries, and sam- ples with different thicknesses of CuMnAs film. The effects of different ratios between the laser spot and the size of the measured device are investigated, and position-dependent measurements are also presented. It is shown that resistivity change with optical excitation using a single 120 femtosecond laser pulse can, in ideal conditions, reach up to 15% at room temperature, which is comparable with the maximum signal obtained with electrical pulses. All of the measure- ments combined with current knowledge of quench switching illustrate the robust behavior of this mechanism across a wide range of conditions. 1

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