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Lifetime and reliability of thermoelectric modules
Rešiliáno, Tomáš ; Šnajdárek, Ladislav (referee) ; Brázdil, Marian (advisor)
The thesis describes the construction of thermoelectric modules used for both electricity production and cooling. Above all, the thesis describes the influences, along with their causes and consequences, that have a major impact on reliability and long-term operation of thermoelectric modules. The thesis further describes the basic quantities with which we can assess the thermoelectric modules and also describes basic methods to measure these quantities. For the purposes of the thesis was conducted an experiment, during which the internal electrical resistance of unused, used and damaged thermoelectric modules was measured. The results were compared with the physical condition and operational history of the measured thermoelectric modules.
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Side collisions of vehicles at an angle of 8° at different speeds
Praus, Tomáš ; Bradáč, Albert (referee) ; Rábek, Vlastimil (advisor)
The diploma thesis deals with the problem of speed determination during tangent collisions of two vehicles. The theoretical part describes the available literature and the preparation of an expert experiment. The practical part describes the experiment itself. Its results are processed and compared with the literature in the theoretical part. The aim of work is to extend knowledge about tangent collisions and reduce the error rate in determining crash in the expert analysis or claims in insurance companies.
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The Effect of the Time of Bird Droppings Remaining on the Vehicle Body on the Damage Degree of the Paintwork
Bílek, Tomáš ; Kaluža, Zdeněk (referee) ; Bradáč, Albert (advisor)
This diploma thesis deals with the issue of the degree of damage done to the vehicle‘s body paint varnish by bird droppings; with respect to the influence of the pollution time on the thickness of the layer of lacquer. The first chapter deals with the importance of varnish and other layers of body protection, types of body varnish damage, painting technology, lacquer defects, bird droppings and its effects on the varnish of the vehicle‘s body. The second chapter is dedicated exclusively to the description, planning and measurement of the coated layers on the vehicle’s body contaminated with bird feces.
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Reconstruction of Data from Damaged CD/DVD
Jarolím, Jordán ; Zbořil, František (referee) ; Drahanský, Martin (advisor)
This bachelor thesis deals with the reconstruction of data from a damaged CD/DVD. The aim is to create an application which will be able to get a bitstream from an image (scanned fragments of a disc) acquired by an optical or electron microscope. This thesis also examines a data representation on the disc, process of preparation of specimens of CD and DVD and scanning of these specimens. The algorithm of the created software, its testing and results are described in this thesis as well.
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Safety of a Commercial Aircraft after Damage to Airframe due to Terrorist Attack
Lošťák, Miroslav ; Salga, Jaroslav (referee) ; Kusák,, Jan (referee) ; Petrásek, Miloslav (advisor)
Modern-day terrorist attacks present a considerable danger for commercial aircrafts. This thesis analyzes potential methods of such attacks with a critical analysis of the most dangerous type: an attack from the outside of the aircraft via a fragmentation missile warhead. Such missiles cause damage to the airframe of the aircraft through fragments created by the explosion. In this thesis, analytical geometry is used to determine the area of the aircraft affected by the fragmentation. The aircraft’s geometry and the fragments’ dispersion are calculated by analytical functions, and the effect of the damage is analyzed. A shooting experiment was also carried out, in which fragments were shot at a reinforced skin panel that was manufactured according to the real design of commercial aircraft. The results of the experiment revealed that only directly hit sections of the structure are damaged. Data obtained by the experiment was then used for the creation and improvement of the model used in the simulation by means of the finite element method. This model is used for the numerical calculation of the damage sustained. Further included in the thesis is an analysis of the change in the load-bearing capacity after such an attack. The relationship between the size of the damage and its effect on the load-bearing capacity of the component as well as the entire structure is defined. First, the effect of component damage is analyzed via the FMEA/FMECA methods. This analysis is then extended using fuzzy logic. Fuzzy logic analysis is based on the determination of the size of the damaged component area and the component’s importance on the structure’s carry loads. Application of the defined approach is described for several parts of an aircraft’s life cycle, including development, operation after the terrorist attack, and assessment of causes after a crash caused by a fragmentation missile warhead.
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Motor vehicle accident analysis
Vičík, Petr ; Ambróz, Richard (referee) ; Laurinec, Marián (advisor)
This thesis deals with a comprehensive view of traffic accident enquiry. There are analysed each step of this investigation, starting with evidence gathering (measurements, photography, ect). Further, there are view of clue, damage and personal injury. Thesis shows commonest analysis and reconstructions methods and calculations and specials types of accident (collision with passenger, trucks crash, motorcycles crash). For better understanding, there are mentioned basic principals of physics and problems of forensic engineering.
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Vznik a vývoj poškození vytloukáním a vystrouháváním srnce obecného na dřevinné vegetaci
Báňa, Dominik
The thesis deals with the occurrence and further development of damage caused by the roe deer (Capreolus capreolus) on woody vegetation. Five research areas were established and camera traps were installed. The frequency of damage to woody plants in the established plots was examined. The number of damaged trees and the frequency of visits over time were recorded. The data indicated that deer are most active from late March to late July. Nevertheless, rubbing damage can occur up to December. Roe deer are mainly active at night, but some activity can occur during the day. Deer in the 2 age categories are the most likely to rubbed. Rubbing can be repeated several times on the same tree by one or more roe deer, but most seedlings have been rubbed only once. In the future, more attention should be paid to this behavior of roe deer from the point of view of research as well as hunting and forestry practice.
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Relativní početnost zvěře a intenzita okusů letorostů na rozsáhlých kalamitních plochách
Brunclík, Martin
This bachelor's thesis deals with the problem of the negative influence of game animals on the growth of unsecured forest culture, recording and evaluating the resulting damage on ten test areas, which were determined according to specific criteria in the territory of the military district of Březina, specifically in the section under the administration of LS Rychtářov, which is part of the Plumlov Division, which falls under the corporate unit Military Forests and Farms of the Czech Republic, s.p. At the same time, the relative frequency of game animals was analyzed using a methodology based on records of droppings. Individual surfaces were compared with each other.
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Návrh a ověření metodiky zjišťování technického stavu kinematických štípačů dřevní kulatiny
Mišurec, Martin
The diploma thesis is focused on the creation of a methodology for the general procedure of determining the technical condition of hydraulic wood splitters and the detection of damage to a set of wood splitters. The work contains a research of the current state of knowledge in the area of valuation of movable property, including valuation of machines. In addition, the thesis focuses on hydraulic kinetic splitters, contains their division into groups and defines their individual working elements. Based on the research, procedures for checking individual elements are created, during which their technical condition is ascertained. The diploma thesis further considers the entire set of splitters, whose damage is evaluated using a mathematical-statistical method. The output of the created methodology is its applicability in the evaluation of the technical condition of the log splitter, or similar machines, as well as the statistical expression of the degree of damage to a set of machines caused during their transport.
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