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Effect of alternative agents on controlled degradation of polypropylene
Kadlecová, Zuzana ; Figalla, Silvestr (referee) ; Bílek, Vlastimil (advisor)
This bachelor’s thesis focuses on the effect of degradation agents in controlled rheology polypropylene and its efficiency. That was evaluated on several types of polypropylene with different molecular weight, the strength of stabilization and content of degradation reagents (organic peroxide and nitroxide Irgatec® CR 76). Melt flow rate, rheometry, and molecular weight distribution methods were applied. Results of each method for unstabilized, stabilized polypropylene and polypropylene containing degradation agent were compared. It was determined, that higher polymer chain degradation efficiency is provided by organic peroxide, lower by nitroxide. The molecular weight distribution of polypropylene was much narrower with peroxide than with nitroxide even though it should have been conversely according to published data. The molecular weight distribution of polypropylene (Mw/Mn) was much narrower with nitroxide than with peroxide at all process temperatures.
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Design, renewal and updating of Geodetic control in Land consolidation
Kvirencová, Petra ; Ing.Jana Indrová (referee) ; Kutálek, Stanislav (advisor)
The bachalor work deals with the analysis of survey in the range of land consolidation. The work plans on filling in minor horizontal control. The work is divided into a theoretical and a practical part organized to chapters. First it deals with theoretical problems of land consolidation and minor horizontal control. Then it carries out the analysis of survey. The practical part aims to plan on filling in minor horizontal control for land consolidation purposes in a cadastral district Malíkov. The revision of existing MHC was analyzed and MHC was resumed and filled in.The final study is enclosed to the end of work.
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Vacuum tube headphone amplifier
Musil, Tomáš ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
This Bachelor’s thesis deals with design and realization of vacuum tube headphone amplifier working in class A. There is a closer look into operating principals of vacuum tube, most common types, basic ways to use it in electronic circuit, designing stabilized power supplies and also realization of functional prototype and measuring it’s parameters.
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Assessment of state banks and a proposal for stabilizing the selected dam reservoir
Kroček, Tomáš ; Pelikán, Petr (referee) ; Šlezingr, Miloslav (advisor)
This thesis covers the state assessment of the selected bank sections of dam reservoirs Vranov and Boskovice. Data used and processed in this thesis were acquired by visiting both sites several times in order to perform measurements and make photographic documentation. Futhermore, data on reservoirs' water levels from 2000-2011 provided by Povodí Moravy s.p. were used. In order to determine bank line regression, the above-mentioned data were processed using the Šlezingr's modification of the method of abrasion terminants determination. Results for dam reservoirs Vranov and Boskovice are then compared with results of dam reservoir Brno, which were produced by the author within the framework of his bachelor thesis using the same method. At the end of the thesis, the author presents several possible forms of stabilization and protection of disrupted banks of dam reservoirs, including their drawings.
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Sensors for driver assistance systems
Ptáček, Martin ; Čala, Martin (referee) ; Beneš, Petr (advisor)
This bachelor thesis is devoted to vehicle stabilization systems, especially to the Anti-lock Braking System ABS, Anti-Skid Regulation ASR and Electronic Stability Program ESP. The main emphasis is placed on sensors needed for implementation of these systems and their required parameters. Findings learned are applied for the implementation of the stabilization system in the model car of the scale 1:10. The relation between the quality of measured sensor data and quality of the resulting stabilization is analyzed using model platfrom testing.
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New possibilities of using secondary raw materials for the renewal of the railway substructure
Buřičová, Karolína ; Luňáček,, Martin (referee) ; Drochytka, Rostislav (advisor)
The work is devoted to new possibilities for the recovery of secondary raw materials and track bed waste with a combination of both suitable and unsuitable soils. The aim of the thesis is to develop a new functional sample suitable for the recovery of a substructure of railways based on secondary raw materials. The theoretical part addresses the issue of the use of soil and secondary raw materials as the base layers of railway structures, and is focused on the possibilities of soil adjustments or enhancement. The practical part is focused on the analysis and selection of potentially suitable raw materials, the design of new raw material mixtures containing concrete recyclables, waste from cleaning the auto mixer and waste from cleaning the rail bed. Further, to modify the mixtures designed with fluid ash from biomass combustion to achieve higher toughness. Then they will be experimentally verified and based on the results the optimal formula for use in the solid of the railway bottom will be determined. Final optimal recipe achieving basic required parameters for use in active zone without the requirement for frost resistance and ecology is composed of 30 % of F4-CS, 4 % of portland cement CEM II-B/LL, 3 % of lime hydrate, 70 % of recycled concrete and 10 % of fluid ash from biomass combustion.
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Autopilot of RC Plane
Denk, Filip ; Bidlo, Michal (referee) ; Mrázek, Vojtěch (advisor)
This thesis is focused on stabilization of the radio-controlled aircraft model. The aim is to create a system that could controll the direction of flight (without pilot intervention) itself. This system also includes determination of the aircraft’s position using a 3-axis gyroscope. The Arduino Uno microcontroller was used as a controll unit.
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Semi-Automatic Control of RC Models
Filo, Martin ; Seeman, Michal (referee) ; Zemčík, Pavel (advisor)
The Bachelor thesis describes problems connected with automatization of RC airplane models. It solves problem with stabilization during the flight from any space orientation. It attaches a set of functions to control the model behavior. There is also a brief description of easy "Do it yourself" gyrocopic unit aimed to testing the behavior of the model on the ground. The thesis uses provided set of functions for very basic control of board with microcontroller MSP430F169.
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Revitalization of the selected section of river "Hartmanický potok"
Samková, Aneta ; Gernešová, Lenka (referee) ; Šlezingr, Miloslav (advisor)
Diploma thesis deal with revitalization Hartmanice river in district Svitavy. Section of interest is on 0,400 – 1,234 of river km. Part of this thesis is also rating current condition of stream and his vegetation accompaniment. Rating was made on base of reconnaissance terrain, my own measurement and photo documentation. In diploma thesis was design some revitalization steps: stabilization sink with wooden sills and stabilization slopes by using willow fences and similar precautions. There was designed total change of flow trend. Rating of current condition and condition of modified stream was made in software HEC-RAS.
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The usability of secondary raw materials in the design of liquefied suspensions based on soil
Hrubý, Jakub ; Kulísek, Karel (referee) ; Černý, Vít (advisor)
The bachelor's thesis deals with the usability of secondary raw materials in the design of liquefied suspensions based on soils in the form of self-compacting grouts. The soil treated in this way can be used as a substitute for backfill material for excavations of engineering networks. The theoretical part deals with the classification and description of soils. Furthermore, the types of soil stabilization using lime, cement, including their liquefaction, are mentioned. A wide range of potentially suitable secondary raw materials and liquefaction mechanization is presented. In the practical part, the basic soil F6-Cl is selected on the basis of a set of available soils. The basic reference mixture consists of soil, lime, cement and liquefier. A proposal for the concept of experimental verification is presented. Part of the concept is the automated calculation of input raw materials. The effect of the action of the superabsorbent polymer and the accelerating additive is verified. Based on optimization selections, functional secondary raw materials are selected. The basic recipe with the optimal amount of accelerating ingredient achieves the best results. Recycled concrete and brick generally improve the resulting parameters. Bed ash achieves the highest strength with the lowest shrinkage.
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