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The conductive layers in LTCC
Poledník, Tomáš ; Psota, Boleslav (referee) ; Kosina, Petr (advisor)
The bachelor thesis was focused on a determination of the limits of screen printing and on estabilishing a power loading of layers on LTCC. It describes the print of the conductive themes via the screen-printing method on the substrata. The thesis contains the description of a measuring on the conductive layers, and a processing its results. It was also performed the printing of layers on a corundum ceramics in order to compare the results. From the measured values were formed the graphs, which represent the possibility of the power loading of layers depending on the temperature and on the width of the thick-layer guide.
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Laser welding of steels in automotiv industry
Paleta, Petr ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
In the automotive industry is beginning to replace the resistance spot welding by laser welding. The bachelor thesis was an analysis of laser welding methods, especially the method of remote welding, which is used for the experiment. Furthermore, the use of laser welding was described. We have also suggested the general technological process of welding. The experimental part was carried by metalografic cut of welded sample, which was evaluated by its macrostructure and microstructure.
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Influence of the burn method on varnish quality
Svačina, Roman ; Blažek, Jaroslav (referee) ; Žák, Ladislav (advisor)
The thesis deals with the influence of the curing process on varnish quality of paint powder coating. The thesis includes a literary study focused on the issue of powder coating. In the experimental part of the work will be done curing of two different materials in three technically different kilns and compare the effect of firing.
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Comparison of assessment of the state of bridges in Germany and the Czech Republic
Víša, Ondřej ; Stehlík, Michal (referee) ; Cikrle, Petr (advisor)
With the increasing age, amount and demands on the quality of bridges, the role of assessing their condition is increasingly important both in the Czech Republic and in Germany. This bachelor thesis compares the general state of bridges in both countries in its theoretical part; furthermore it compares the standards, terminology, the way of keeping record and evaluation. The practical part is reserved for survey and assessment of a bridge in Germany and for comparison purposes also in the Czech Republic. In its end the thesis summarizes the most fundamental differences between Czech and German methods.
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Multi-filament yarns testing for textile-reinforced concrete
Kaděrová, Jana ; Seitl,, Stanislav (referee) ; Vořechovský, Miroslav (advisor)
The scope of the presented master thesis was the experimental study of multi-filament yarns made of AR-glass and used for textile-reinforced concrete. The behavior under the tensile loading was investigated by laboratory tests. A high number of yarn specimens (over 300) of six different lengths (from 1 cm to 74 cm) was tested to obtain statistically significant data which were subsequently corrected and statistically processed. The numerical model of the multi-filament bundle was studied and applied for prediction of the yarn performance and for later results interpretation. The model of n parallel filaments describes the behavior of a bundle with varying parameters representing different sources of disorder of the response and provides the qualitative information about the influence of their randomization on the overall bundle response. The aim of the carried experiment was to validate the model presumptions and to identify the model parameters to fit the real load-displacement curves. Unfortunately, due to unsuccessful correction of measured displacements devalued by additional non-linear contribution of the unstiff experiment device the load-displacement diagrams were not applicable to model parameters identification. The statistical evaluation was carried only for the maximal load values and the effect of the specimen size (length) on its strength was demonstrated. The size effect curve did not exclude the existence of spatial correlation of material mechanical properties modifying the classical statistical Weibull theory.
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Survey and Assessment of highway D2 Bridge
Výpustek, Libor ; Suza, Igor (referee) ; Cikrle, Petr (advisor)
This thesis deals with the exploration and evaluation of the existing bridge carried him on the highway D2. The work is divided into theoretical and practical parts. The theoretical part focuses on the technical surveys, diagnosis of building structures and some methods of investigation and testing of building structures. In the practical part the visual inspection and diagnosis of disorders of the highway bridge substructures ev. No. D2-058, to determine material characteristics substructure and evaluate the state of the bridge. In conclusion, the practical part of the recommendations for the design and method of repairing the bridge.
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Adhezive bonding in the car industry
Bláha, Aleš ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This thesis examines bonded joints of car bodies, which are the most mechanically challenged for selection of suitable, modern adhesives for the construction of the car body. The first part focuses on the description of the bonding technology, including theoretical knowledge related to the use for bonding assemblies for bodywork. The specified structure and its solution is carried out in the way that were selected by three types of adhesives SIKA and mutual comparison of their properties. After that an experimental test is conducted at 18 samples per overhanging shear tensile strength and finally followed by the evaluation and selection of the most appropriate and optimal variant for various bonding applications.
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Bones implants based on Fe and Mg
Košíček, Adam ; Zatloukal, Miroslav (referee) ; Sedlaříková, Marie (advisor)
This paper work deals with properties of metallic biomaterials in terms of their suitability for use as a temporary metal implants. The work focuses on biodegradable materials based on iron and suitable alloying elements, which would create a perfect implant. A part of this work describes procedure of creating biodegradable metallic samples with alloying element Magnesium and measuring the corrosion rates. There are a few theoretical chapters concerning permanent implants, function and composition of human bones, iron and magnesium in human body and biodegradable materials.
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Design of manipulator for TEM
Melichárek, Václav ; Doležel, Pavel (referee) ; Mach, Jindřich (advisor)
The topic of this master’s thesis is the design of a sample manipulator for TEM. Regarding which the segment of the sample manipulator used to move the sample in the direction of the x-axis (so-called x-stage) was designed. The introductory theoretical part is concerned with a brief description of transmission electron microscopy focused on the imaging methods used in TEM and the procedures of preparing and loading TEM samples. The theoretical part follows with the design of precise mechanisms, especially with respect to the inaccuracies of their operation and the technological aspect of the design. In the practical part, a detailed analysis of the design of the x-stage is presented. Kinematics and dynamics of the mechanism is analyzed in depth, following with the description of the overall design of the mechanism and some of its parts in detail.
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