National Repository of Grey Literature 394 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Phase imaging below the diffraction limit
Nečesal, Daniel ; Bouchal, Zdeněk (referee) ; Dvořák, Petr (advisor)
Tato diplomová práce se zabývá konstrukcí interferenčních zařízení pro výzkum měření fáze světla na mikro-strukturách a fáze plazmonů na nano-strukturách. V první kapitole je vybudován teoretický základ pro optiku a nano-fotoniku používané v budoucích kapitolách. Následně je popsána interference vln a jejich praktické použití pro prolomení difrakčního limitu pomocí holografie plazmonů. Prvním experimentální sestavou je Machův-Zehnderův holografický mikroskop. Je popsán způsob, jak ho sestavit z běžně dostupných součástek a jak je navržen ovládací software k jeho používání. Následně jsou popsány výsledky naměřené pomocí tohoto zařízení. V poslední kapitole se zaměříme na sestavení holografického SNOM přístroje pro studování plazmonů a jejich interference. Nejdříve popíšeme základní princip a navržení softwaru pro automatizaci měření, pro zrychlení vědeckých postupů. Nakonec předložíme výsledky měření mikroskopu.
Interaction between SNOM tip and near-field
Krpenský, Jan ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
Interaction between a probe for scanning near-field optical microscopy (SNOM) and near electromagnetic field is a fundamental problem, with its solution being a necessary condition for the correct interpretation of experimental data. This bachelor's thesis is aiming to thoroughly describe this problem and by precise manufacturing of our own SNOM probes help to reach solution of this problem. For this purpose, the detection of near-field generated by interference of surface plasmon polaritons (SPP) on square shape nanostructures is being used. This study has proven the dependence of SNOM probe sensitivity to near-field components on the size of a SNOM aperture.
Voltammetry with Preliminary Extraction as a New Approach for Rapid Determination of Formaldehyde in Wood-Based Products
Dvořák, Pavel ; Vyskočil, Vlastimil (advisor) ; Dejmková, Hana (referee)
The aim of the presented Diploma Thesis was to develop a new method for the indirect determination of formaldehyde in wood-based products using gas-diffusion microextraction coupled with electrochemical detection on unmodified screen-printed electrodes (MLEM-SPCE). Formaldehyde released from the sample is derivatized using an acetylacetone reagent present in an acceptor solution. The product of derivatization of formaldehyde with acetylacetone is 3,5-diacetyl-1,4-dihydrolutidine (DDL) which forms a selective oxidation voltammetric peak at a potential of 0.4 V. Detection and quantification limits of 0.57 mg kg−1 and 1.89 mg kg−1 , respectively, were obtained, together with intra- and inter-day precision below 10% (as relative standard deviation, RSD). The developed methodology was applied to determine formaldehyde content in seven samples. Similar results were obtained from the European standard method EN 717-3 with a significant reduction of total analysis time. The developed method MLEM-SPCE, which combines the use of a new sample preparation procedure for volatile compounds with the firstly introduced determination of formaldehyde (as the derivative product DDL) on unmodified SPCEs, proves to be a promising alternative for the determination of formaldehyde in wood-based products and other samples.
Extension of the production hall
Dvořák, Petr ; Rubina, Aleš (referee) ; Rubinová, Olga (advisor)
The bachelor thesis deals with the design of air-handling devices for the first floor of the production hall extension. The devices are designed to achieve operational, functional, and hygienic requirements. The changing room and sanitary facilities are warm air heated. For purposes of the showrooms is designed central air conditioning. The dining room and food preparation areas are also air-conditioned. The theoretical part focuses on the influence of the shading coefficient and direct solar radiation on the course of heat gains.
Push-pull quasi-resonant DC/DC converter with a transformer
Dvořák, Petr ; Vorel, Pavel (referee) ; Martiš, Jan (advisor)
This diploma thesis deals with analysis of function and subsequent construction of a quasi-resonant DC / DC converter 300 V / 50 V for an output of about 1.5 kW. The aim of this work is to test and describe the behavior of an experimental converter at various operating parameters. In the theoretical part, resonant circuits are described, as well as our connection of the resonant converter. Based on the used topology and the simulated behavior of the converter, the individual components of the power circuit and its control and excitation circuit are designed in Chapters 4 and 5. The sixth chapter deals with the construction and testing of the converter, including a description of its behavior. The last chapter contains technical documentation.
Nanophotonics
Dvořák, Petr ; Rezek, Bohuslav (referee) ; PhD, Jakub Dostálek, (referee) ; Šikola, Tomáš (advisor)
This thesis deals with an experimental research of the surface plasmon polaritons (SPPs) using Scanning Near-field Optical Microscopy (SNOM). The first chapter provides theoretical background and a description of most of the physical phenomena and relevant dependencies studied in this work. These dependencies include the dependence of the resulting SPP image on homogeneity, polarization, wavelength and phase of the illumination, on the geometry of the interference structures and on the tilt of the sample with respect to the illumination. Further, this work presents a new experimental method which, using the numerical simulations or SNOM measurements, allows to estimate the sensitivity of SNOM probe to detect the individual electric intensity components of the near-field. At the end of the thesis, the work presents a new microscopic technique which enables a 3D quantitative imaging of phase distribution above the plasmonic metasurfaces.
Multifunctional building
Dvořák, Pavel ; Šobrová, Zdena (referee) ; Utíkalová, Ivana (advisor)
The aim of the diploma thesis is to elaborate project documentation of a new-build mixed-use building in Moravske Budejovice, in the cadastral area of Moravske Budejovice. The mixed-use building comprises a partial cellar and three floors above the ground. In the cellar, technical facilities and storage space for the residental part of the building can be found. The ground floor and the part of the first floor are designed for commercial premises, a hairdresser's, a florist's, a bookshop and a café. Residental unit consisting of three flats is located on the first and second floor. the building is made from 300 mm thick ceramic construction blocks with the external thermal insulation system. Ceiling construction is made of 250 mm thick concrete monolithic panels. Furthermore, the documentation deals with potable water, electric power and gas couplers, sewerage system, rainwater sewer and paved surface for pedestrians and motor vehicles. The thesis is elaborated as documentation for the building execution.
Study of rehabilitation of selected part of sewer network
Dvořák, Pavel ; Helcelet, Marek (referee) ; Raclavský, Jaroslav (advisor)
The topic of this thesis is to create a study of the rehabilitation of the sewer network. The sewer system under assessment is located in city Znojmo, specifically Znojmo – city. In this case, rehabilitation is proposed in order to improve the functional operational properties of the sewer network and extend its service life. The work was divided into two basic parts, namely the Accompanying and Summary Technical Report. Three variants of solution were proposed. The first two variants are made as trenchless using a sanitation sleeve in the first one and a short sanitation sleeve in combination with a sanitation sleeve in the second. The third variant is made as an open excavation recovery. A description of the rehabilitation technology was carried out and the facts that each individual Option or what the three Option would bring up were defined. These three variants of the solution are assessed in terms of economic, technical and environmental impact.
Length bounded cuts in graphs
Berg, Michal ; Kolman, Petr (advisor) ; Dvořák, Pavel (referee)
In this thesis we will focus on a problem of length bounded cut, also known as L-bounded cut. We are going to show a combinatorial algorithm for finding a minimal L-bounded cut on graphs with bounded treewidth based on dynamic programming. Then we going to show that this algorithm can also be used for finding minimal L-bounded cut on plannar graphs. We are also going to look at problem of (dG(s, t) + 1)-bounded cut. This problem is known to be NP-hard for general graphs. But it is an open problem whether this problem is also NP-hard on plannar graphs with special vertices on the outer face. We will try to outline a way, which might lead to showing that this problem is solvable in a polynomial time.

National Repository of Grey Literature : 394 records found   1 - 10nextend  jump to record:
See also: similar author names
47 DVOŘÁK, Pavel
83 DVOŘÁK, Petr
5 Dvořák, P.
47 Dvořák, Pavel
83 Dvořák, Petr
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1 Dvořák, Prokop
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