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Possibility of using EMW radiation for killing biotic pests
Gintar, Jan ; Klečka,, Tomáš (referee) ; Pěnčík, Jan (referee) ; Šuhajda, Karel (advisor)
The remediation of building elements and structures in terms of moisture and sterilization (inactivation) of biotic pests is dealt with quite often in construction practice and in the construction industry itself, and is thus a topical issue. The issue is dealt with by specialized companies that know the use of available technology on the market, or are themselves involved in the development and improvement of these devices. Several methods are known for the removal of moisture and sterilization of biotic pests, with sufficiently high-quality data on the technology used, the suitability of the equipment used, a more detailed description of the application of the methods themselves and the results themselves. The methods themselves, for removing moisture and eliminating (inactivating) biotic pests, must be chosen according to individual requirements, as some methods will be more appropriate (more effective) and some less suitable. For the practice itself, however, it is important that the methods are sufficiently effective and at the same time available to the wider public (their economic side). In my dissertation thesis I focus on the potential of EMW radiation utilization not only for liquidation of biotic pests (fungi, fungi, wood decaying insects), but also elimination or reduction of necessary conditions for survival or development of these biotic pests. Therefore, my work also focuses on the presence of moisture, because moisture is a common factor in the vast majority of problems associated with the occurrence of biotic pests. Due to its intensity, it is one of the less time-consuming method and therefore a more cost-effective (economically) method. The research I conducted at VUT FAST focused on the use of microwave radiation in the control of biotic pests, under conditions that are close to those on real constructions. The use of a microwave method to eliminate biotic pests and at the same time to remove moisture has proved to be advantageous.
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Frequency synthesizer for microwave communication systems
Klapil, Filip ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
The main aim of the thesis is to develop a solution of a frequency synthesizer for a microwave communication systems. Specifically, it suggests a design for frequency synthesizer with phase-locked loop. At beginning of the thesis the principle and basic properties of this method of signal generation are explained. Then it is followed by a brief discussion of the parameters of synthesizers and their influence on design. Another part of the work is the analysis of circuit the frequency synthesizer with the phase-locked loop MAX2871, which is followed by a proposal for the design of the frequency synthesizer module hardware. The last part of the work deals with practical implementation, verification of function and measurement of achieved parameters and their evaluation.
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Disposal of Biotic Pests by EMW Radiation
Sobotka, Jindřich ; Klečka,, Tomáš (referee) ; Myslín, Jiří (referee) ; Tomíček,, Oldřich (referee) ; Šuhajda, Karel (advisor)
The possibility of using high-frequency electromagnetic radiation in the construction sector is a common knowledge. Various experiments have been carried out to dry construction materials, or even to destroy biotic pests. However, the majority of these experiments have been executed in laboratory conditions. It means they have been carried out under exact limiting conditions, often very far off those conditions in real building practice. Therefore, this dissertation aims at exploring the possibility of utilizing microwave technology in drying and heating of construction materials, in disposing of biotic pests and sterilizing building materials under real conditions in building practice. The thesis will explain that microwaves are a term given to a part of electromagnetic radiation. Electromagnetic radiation is based on the principle that the radiated energy is absorbed by water molecules present in moist building material. In the mass of the irradiated material, the radiated energy is transformed into thermal energy, where a so-called “motion” of water molecules occurs with the energy then being transformed into kinetic energy. The microwave technology itself offers a very wide range of use, which can be easily achieved, thus making the technology available to use in the future. Part of the experiments and the necessary measurements, too, has been carried out on selected types of building materials in the premises of the Faculty of Civil Engineering of Brno University of Technology. They have been executed under conditions which most closely correspond to the conditions in real buildings. Part of the experiments and the necessary measurements were carried out on particular constructions, by the so-called in situ method. As stated in the conclusion of the dissertation, laboratory measurements and the in situ measurements differ considerably in some cases.
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Analysis of EMW radiation for sterilization of biotic pests
Danielová, Marie ; Svobodová, Kateřina (referee) ; Holešovský, Jan (advisor)
Biotic pests such as wood-destroying fungi, molds, and wood-destroying insects are not only a problem for old buildings but also for newer buildings. Their occurrence has a negative effect on the physical and mechanical characteristic of building materials. One of the main causes of biotic pests in buildings is moisture. Remediation of objects in terms of moisture and biotic pests is a frequent subject of solution in construction practice. There are many methods used to remove moisture and inactivate biotic pests, and their use depends on the individual requirements of individual objects. In practice, this problem is dealt with by specialized companies using well-known technologies or further participate in their research. One of the methods used for moisture remediation and inactivation of biotic pests is the irradiation of building structures using EMW radiation. Microwave heating used to dry moisture from building materials is one of the most intensive methods for sterilizing biotic pests, and due to its intensity, it is a time and cost-effective method.
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Microwave induced pyrolysis of biomass
Šmarda, Marek ; Gal, Pavel (referee) ; Jícha, Jaroslav (advisor)
In this bachelor thesis there are informations about different methods of processing organic nature substrate with a focus on a waste processing using microwave pyrolysis. In sum it is possible to say that microwave pyrolysis is a progressive solution to process waste substrate. Due to evenly and rapid heating of organic nature substrate, this method is more effective compared to conventional methods of waste disposal. The result of this work is to submit information on processing waste substrate in the form of microwave analysis and subsequent economic evaluation.
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Possibility of using EMW radiation for killing biotic pests
Gintar, Jan ; Klečka,, Tomáš (referee) ; Pěnčík, Jan (referee) ; Šuhajda, Karel (advisor)
The remediation of building elements and structures in terms of moisture and sterilization (inactivation) of biotic pests is dealt with quite often in construction practice and in the construction industry itself, and is thus a topical issue. The issue is dealt with by specialized companies that know the use of available technology on the market, or are themselves involved in the development and improvement of these devices. Several methods are known for the removal of moisture and sterilization of biotic pests, with sufficiently high-quality data on the technology used, the suitability of the equipment used, a more detailed description of the application of the methods themselves and the results themselves. The methods themselves, for removing moisture and eliminating (inactivating) biotic pests, must be chosen according to individual requirements, as some methods will be more appropriate (more effective) and some less suitable. For the practice itself, however, it is important that the methods are sufficiently effective and at the same time available to the wider public (their economic side). In my dissertation thesis I focus on the potential of EMW radiation utilization not only for liquidation of biotic pests (fungi, fungi, wood decaying insects), but also elimination or reduction of necessary conditions for survival or development of these biotic pests. Therefore, my work also focuses on the presence of moisture, because moisture is a common factor in the vast majority of problems associated with the occurrence of biotic pests. Due to its intensity, it is one of the less time-consuming method and therefore a more cost-effective (economically) method. The research I conducted at VUT FAST focused on the use of microwave radiation in the control of biotic pests, under conditions that are close to those on real constructions. The use of a microwave method to eliminate biotic pests and at the same time to remove moisture has proved to be advantageous.
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Microwave-assisted preparation of polymer materials
Bujok, Sonia ; Beneš, Hynek (advisor) ; Brožek, Jiří (referee) ; Duchet-Rumeau, Jannick (referee)
Bearing in mind environmental concerns and global trends in ecology, biodegradable polyesters have gained enormous attention as alternative to non-biodegradable, commercial polymers used mainly in packaging industry contributing to the worldwide environment pollution. However, substitution of conventional polymers with biodegradable polyesters is limited due to their inferior mechanical and barrier properties, which can be improved by the introduction of relatively small content of non-toxic nanofillers. Nevertheless, environmental pollution is not only affected by material itself, but also manufacturing and processing sector in terms of energy sustainability. In case of the latter, low energetic processes are nowadays preferential. Thus, using microwave irradiation as the more efficient energy source, which can lead to shortening of process time, has become currently investigated subject. In this thesis, microwave-assisted in-situ synthesis of biodegradable nanocomposites based on polycaprolactone and non-toxic clay nanoparticles (layered double hydroxides) was studied and described in detail in four subsections (4.1-4.4). The first subsection (4.1) describes one-pot synthesis of Mg2+ /Al3+ layered double hydroxides functionalized with highly microwave-absorbing ionic liquids. In order to improve...
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Posouzení působení mikrovln na zkušební tělesa při průchodu kontinuálním zařízením
Šitta, Ondřej
This work deals with drying of the beechwood using microwaves. In the first part there is teoretically discussed the wood in general and its behavior related with drying. The beechwood is here described in detail and also its properties. Another point of the teoretical part is focused on microwaves and its use for drying wood. Second part deals with drying of the beechwood samples using continous microwave line. Twenty beechwood samples were split on radial and tangent samples and they were put on ma-chine belt of the drying machine. Before and after each entry through the drying machi-ne each sample was weighed. This process was repeated till almost zero moisture of the tested sample. Then small parts were cut from each sample, three from each edge and three from the middle part of the tested sample. Three parts (edge, middle, edge) were used for prong test, three for finding the value of crustiness using the CEN test and three of them cut on even smaller parts for finding the moisture gradient. The result was evaluation of wood drying and its quality after drying
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Frequency synthesizer for microwave communication systems
Klapil, Filip ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
The main aim of the thesis is to develop a solution of a frequency synthesizer for a microwave communication systems. Specifically, it suggests a design for frequency synthesizer with phase-locked loop. At beginning of the thesis the principle and basic properties of this method of signal generation are explained. Then it is followed by a brief discussion of the parameters of synthesizers and their influence on design. Another part of the work is the analysis of circuit the frequency synthesizer with the phase-locked loop MAX2871, which is followed by a proposal for the design of the frequency synthesizer module hardware. The last part of the work deals with practical implementation, verification of function and measurement of achieved parameters and their evaluation.
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