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Study of the thermal insulation effect of thermally reflective insulations
Skříček, Darek ; Vala, Jiří (referee) ; Čermák, Jan (referee) ; Šťastník, Stanislav (advisor)
The dissertation on the topic Study of the thermal insulation effect of thermally reflective insulations is focused on the issue of measuring the thermal resistance R of thermoreflective insulations and determining the most suitable layer with the best thermal insulation properties. By measuring thermoreflective insulations on the Hot-Box measuring chamber, it was proven that higher values of thermal resistance R are always achieved with aluminum foil, which has the highest possible reflection of the radiant component of heat, i.e. the lowest possible emissivity on the surface. For this reason, the reflectance was measured on the Mid-IR Integrat IR ™ measuring apparatus. To study the thermal insulation effect of thermoreflective insulations, ten samples of these insulations with different compositions of aluminum and bubble foils are used to measure the insulation properties. The suitability of using thermoreflective insulation for building insulation was proven by measuring these foils.
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Implementation of a Multipurpose Measurement System for (Sub)Terahertz Electron Spin Resonance Spectroscopy
Šedivý, Matúš ; Malik, Aamir Saeed (referee) ; Epel, Boris (referee) ; Vrba, Radimír (advisor)
Spektroskopie elektronové spinové rezonance (také nazývaná elektronová paramagnetická rezonance nebo jen EPR) zahrnuje metody, které zkoumají hmotu prostřednictvím nepárových elektronů. Jednou z progresivních metod EPR je rychlé skenování, které umožňuje pozorovat kinetiku chemických reakcí. Kromě toho nedávný vývoj vysokofrekvenčních součástkách rozšířil použití vysokofrekvenční EPR (HFEPR), které využívají sub-terahertzové až terahertzové vlny. Tato práce se zabývá propojením obou cest do HFEPR spektrometru s rychlým skenováním frekvencí (FRaScan), který byl nedávno vyvinut na CEITEC VUT. Na začátku je stručně uvedena základní teorie k EPR, následovaný přehledem přístrojového vybavení pro HFEPR. V praktické části je popsáno technické řešení spektrometru. Důraz je kladen na implementaci softwaru, pomocí kterého je spektrometr ovládán a měření jsou automatizována. Následně jsou ukázány příklady z měření pevných látek, konkrétně karbidu křemíku dopovaného vanadem (SiC:V), ftalocyaninu líthia (LiPc) a krystalu 1,3-bisdifenylen-2-fenylallylu (BDPA). Příklady demonstrují schopnosti spektrometru získat multifrekvenční vlnově spojitá EPR spektra a frekvenčně rozmítaná spektra v závislosti na teplotě a orientaci vzorku, a taky spektra pomocí rychlého skenování frekvencí
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Vertical green walls
Utíkalová, Ivana ; Dulenčín, Juraj (referee) ; Novotný, Marek (referee) ; Košíčková, Ivana (advisor)
ABSTRACT The concepts of vertical gardens, vertical walls, green walls, living walls or green faca-des can be referred to as vertical plantations for planting the walls or columns of various objects. They are defined under the name of vertically situated plant plantings, which, according to the used plant taxa, can be applied both indoors and outdoors. Contemporary architecture is increasingly looking for ways to return greenery to human settlements, and vertical gardens are one of the solutions that can respond to the lack of free space for greenery, especially when solving development within settlements and return at least part of nature to the interior of cities and municipalities. Last but not least, the system solutions of vertical gardens for the creation of vegetation vertical walls in the interior and on the facades of buildings offer the possibility of making vari-ous and architecturally interesting areas, permanently overgrown with vegetation. The dissertation deals with the topic of greening facades, especially using systems not associated with open ground - the so-called vertical gardens. Since the knowledge on this issue is still poorly documented and the implementation of green facades of the-se systems in our country is not much, based on these facts, I decided to create my own real model of the facade system of vertical vegetation walls in the climatic conditions of the Czech Republic with local taxa. plants. In the initial phase of the work, an analysis of the available green wall systems is performed and a planar panel of the vertical green wall is designed. In the next phase, the influence of these walls on the temperature of the perimeter cladding and the surroundings of the building in comparison with the fa-cade without greenery is verified by monitoring the growth of plants and measuring the temperatures on the green facade of a specific building. The evaluation of the experiments and the acquired knowledge provided informati-on on how t
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Uncertainty Evaluation in Photometry and Radiometry
Motyčka, Martin ; Bálský,, Marek (referee) ; Gašparovský,, Dionýz (referee) ; Škoda, Jan (advisor)
This dissertation thesis is focused on the uncertainty analysis of the spectroradiometric and photometric measurements. The measurement uncertainty should be stated in every measurement protocols or calibration certificates. Recently the luminance cameras are widely used for the luminance measurements in the whole scene with a good resolution and measuring time. However, there is no uncertainty estimation method for these measuring devices. Therefore, this thesis analyses the luminance measurement uncertainty of the luminance analyser LDA – LumiDISP, that can be classed as a luminance camera. Since the calibration procedure is very complicated and traceable to other measuring photometric devices, there is a detailed description of the measurement uncertainties of luxmeters, luminance meters, spectroradiometric systems and its practical calculations for these systems in the light laboratory FEKT Brno University of Technology. However, the measurement uncertainties estimation of the spectroradiometric systems is especially difficult for the output quantities calculated from the spectral power distribution of the light source. In this thesis there is presented a method of uncertainty measurement and estimation of these spectroradiometric systems and luminance analyser LDA, where the luminance measurement uncertainty varies with the measured spectral power distribution of the light source, its position in the luminance image and the exposure settings.
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Difuzní vlastnosti OSB desek v důsledku zasažení nadměrnou vlhkostí.
Žižková, Lucie ; Vertal', Marián (referee) ; Chybík, Josef (referee) ; Bečkovský, David (advisor)
The presented dissertation focuses on the change of diffusion properties in oriented strand board (OSB) panels after exposure to excessive moisture. OSB panels undergo a change in their diffusion properties after being affected by excessive moisture and subsequently dried, causing them to deviate from the original design of the wooden wall structure. The aim of this study is to describe the experimentally measured change in diffusion properties and incorporate it into the composition of a real wooden wall structure, evaluating its performance through computer simulation. The introduction of the dissertation provides the theoretical basis for the experimental section, which includes measurements of water absorption, diffusion properties, and the risk of mold growth. The experimental section describes the approaches and methods used to achieve the objectives of the dissertation. The measurements were conducted on test samples of OSB panels in the laboratories of the Institute of Civil Engineering. After being exposed to excessive moisture, the test samples were dried using two drying methods. The dried test samples were placed in testing assemblies, where diffusion was measured using the dry cup method. The measurements were carried out in two stages, with more than 80 samples measured in each research stage. In the final part, the measurements are evaluated through graphs. The change in diffusion properties was then incorporated into the composition of a real wooden wall structure and assessed using computer simulation, which is more commonly used in practice according to ČSN 73 0540 (Czech Technical Standard).
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Implementing of SPC into production process
Letáček, Jiří ; Koška, Petr (referee) ; Fiala, Alois (advisor)
This graduation thesis is concerned with implementing the SPC (Statistical process control) to the process plan. The aim of this thesis is an analysis of present status of manufacture laths bending and a selection of useful methods, which is possible to apply in a company processes. The main reason for SPC implementation is continual improvement of quality in manufacturing concern. The theoretical part of thesis consist of bending description, control of process quality, quality control instruments and errors in measurement. In practical part is described an actual status of manufacture and a solution of query.
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Application of Electromagnetic and Acoustic Emission for the Diagnostics of Advanced Composite Materials
Trčka, Tomáš ; Chobola, Zdeněk (referee) ; Lokajíček,, Tomáš (referee) ; Koktavý, Pavel (advisor)
The subject of this dissertation is a theoretical and experimental study of electromagnetic and acoustic emission generated in the course of crack formation in solid dielectric materials. Theoretical part of this work is focused on the electromagnetic emission method, because it is related to a number of unsolved problems in the field of generated emission signals measurement, as well as in the field of the correct interpretation of obtained experimental data. Consequently, issues of emission signals detection by capacitance sensors and the transformation of crack primary parameters on the measured variables within the proposed transfer system have been dealt with. The results in this area were an extension of application range of the electromagnetic emission method on composite materials (especially on fiber reinforced polymer composites), identification and evaluation of the most significant emission sources in investigated composites and developing a methodology for evaluating of the crack primary parameters based on the measured emission signals waveforms in time and frequency domain. The experimental part of this dissertation was focused on a complex methodology for emission signals (including data from additional sensors) continual recording, processing and evaluation and for monitoring the response of stressed material to an applied mechanical load in real-time. Partial results from different research areas were also implemented into this methodology. This included the detection of emission signals, design and implementation of the appropriate measuring apparatus, analysis of measured signals in the time and frequency domain and advanced methods for processing and evaluation of measured data.
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Numerical Modeling of Periodical Structures
Nešpor, Dušan ; Bartušek, Karel (referee) ; Brančík, Lubomír (referee) ; Fiala, Pavel (advisor)
The thesis discusses the dynamic electromagnetic field on periodic structures. The author focuses on three principal types of resonant structures, considering their application possibilities. In general, these types can be individually defined as follows: materials exhibiting a negative refractive index of the incident electromagnetic wave; structures with gradual changes in impedance, characterised by their usability as reflectionless surfaces; and periodic structures able to conveniently shape the magnetic field distribution. Materials of the third group within the above-shown short list facilitate the fabrication of magnetoinductive lenses for nuclear magnetic resonance. The presented analysis of the properties of periodic resonant structures is mainly based on numerical models utilising the finite element method, and this approach is combined with both the derivation of the corresponding analytical relations and an experimental measurement of the non-radiating component of the electromagnetic field. The thesis includes a physical description of the basic elements of periodic resonant structures. Physical properties of the elements were examined in detail via numerical analysis. In the course of the research, the data acquired through this analysis and the related experimental measurement enabled the author to propose a method for optimising the most widely used resonant structures. Moreover, several new versions of resonant elements, structures, and fabrication techniques were also designed. The results obtained from the numerical analyses carried out to examine the central physical properties of the fabricated structure samples were all verified via the designed method for measuring the non-radiating component of the magnetic field.
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Spica/ Brno, Nove sady 49°11'20.3"N 16°36'29.4"E
Csanda, Denis ; Kisová, Barbora (referee) ; Nový, Vítězslav (advisor)
Design „micro-urbanism“ in designated area. Aim of this work is to find suitable development strategy of open city block. Bachelor‘s thesis adresses design of poly-functional building, including town hall and housing in city Brno. The main theme is to find maximal, yet optimal solution to site, which functions as parking space. The design tries to complete corner of designated city block, which will be part of future „south“ neighbourhood. The townhall and housing should function in harmony, which means the building will „live“ all-day long. The site is located in the node of historic centre and new planned neighbourhood. Between the site and neighbouring building will be parking garage tucked under the ground. Also there will be multifunction hall undergound center of the site. Design of the volume is complex and consists of pedestal and 3 towers. These towers volumes pixelate into the pedestal and open into the courtyard. Facade consists od unite form, which disolves and open in the upper levels.
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