Master’s thesis in the theoretical part analyses the heating factor (Q), which has significant share on quality of a solder joint. The practical part describes the design and production of test PCB and setting temperature profiles, SMD resistors soldering by using BiSn solder paste. Shear tests of SMD solder joints were realised and evaluated including isothermal ageing samples. At the end of master’s thesis solder joints visual aspects and defects were evaluated, measurement thickness of intermetallic compound by not only optical microscope but also SEM, discussion about results and Q was evaluated.

Diplomová práce vznikla ve spolupráci s průmyslovým partnerem, který vyrábí elektrické komponenty pro automobilový průmysl. Tato firma se potýká s problémy často se porušujících jader v některých jejich formách na vstřikování plastů, vyrábějících převážně housingy pro konektory. Firma disponuje licencemi na komerční software pro simulaci injekčního vstřikování Moldflow a Moldex3D a také pro simulaci metodou konečných prvků Ansys. Nejprve jsou shrnuty teoretické poznatky ohledně injekčního vstřikování a jeho simulace, řešení problémů interakce těles s tekutinou a únavy materiálu. Poté je popsán proces stanovení únavové životnosti jádra formy s využitím výše zmíněného softwaru. Proces je vysvětlen na příkladu konkrétní formy ve výrobě této firmy. Je zvolen takový přístup vyhodnocení únavy, který nejvíce odpovídá současné životnosti jader, a ten je pak použit pro analýzu vlivu změny geometrie jádra a parametrů vstřikování. Změny ostatních parametrů, které simulace neumožňuje zahrnout, jsou rovněž navrhnuty a pokud možno odůvodněny jinými způsoby. Jedno z doporučení je přidání zaoblení na obě jádra, což by mohlo prodloužit životnost toho problematičtějšího z nich z 30 dnů na více než 320 dnů. Toto by mohlo znamenat úspory až 10 600 EUR ročně. Další doporučení je změnit způsob obrábění jader a také přidat jejich tepelné zpracování.

This master´s thesis deals with an examination of different solution types a for the chemical passivation of a silicon surface. Various solutions are tested on silicon wafers for their consequent comparison. The main purpose of this work is to find optimal solution, which suits the requirements of a time stability and start-up velocity of passivation, reproducibility of the measurements and a possibility of a perfect cleaning of a passivating solution remainig from a silicon surface, so that the parameters of a measured silicon wafer will not worsen and there will not be any contamination of the other wafers series in the production after a repetitive return of the measured wafer into the production process. The cleaning process itself is also a subject of a development.

Low cost, rapid and high thermal by IR heating, rapid cooling and high efficiency, there are RTP (Rapid Thermal Processing) properties. We can use RTP for annealing, diffusion, contacting, oxidation and others. Rapid temperature change and IR heating can be followed positive effects in the silicon substrate. This paper is focused on annealing by RTP. Wafers were p-type monocrystalline CZ silicon with different bulk minority carrier lifetime. Minority carrier lifetime was measured by MW-PCD (Microwave Photoconductance Decay) before and after thermal processing.

This work is focused on description how the light impact human live, description of light sources and finally design and construction of light source with adjustable colour temperature and luminous flux. In introduction is mentioned the process of vision and how the light impact humans. In next part is characterization of currently used light sources, their construction, properties, benefits and drawback with their main parameters. Important part of this chapter is more extensive description of light emitting diodes with their operational parameters. The last two parts is focused on design and measuring the parameters of created light source with adjustable colour temperature and luminous flux and evaluating the results.

Content is focused on fluorescence lifetime imaging techniques. Fluorescence lifetime is computed from data acquired with using of Leica TCS SP8X confocal microscope sequential scanning. Algorithms and software for the computation, imaging and analysis of fluorescence lifetime is presented. Software is allowing both 2D and 3D imaging of fluorescence lifetime. Techniques are used for fluorescence lifetime imaging of mesenchymal cells and fibroblasts tainted with SPIO-Rhodamin complex.

The thesis deals with vibrations caused by geometric defect and fatigue damage of rolling element bearing. Hardware for vibration measurement is tested on 25 new pieces of NJ 304. Second part of the thesis examines if measuring of bearing vibration can help to detect a geometric defect. Geometric defects are detected according to a spectrum of vibration but the results are not absolutely exact. The possibility to detect geometric defects by measuring vibration has not been proven. The end of project tests diagnostic methods for rolling element bearings. The bearing defect was simulated to demonstrate bearing failure frequencies, envelope method and vibration spectrum.

This thesis is dealing with the issue of residual stress present in the wall of a polymer pipe and the influence on its lifetime. Experimental data obtained by the ring slitting method are evaluated and the tangential residual stress in the wall of polypropylene pipe is determined. The evaluation is carried out using a new methodology based on the curved beam theory. The method is verified using numerical simulation. 3D numerical model is used to verify the behavior of the pipe, when there are both tangential and axial residual stresses present in the pipe wall, because the presence of axial stress causes a rise in the magnitude of tangential residual stress. A correction of the tangential stress values corresponding to the pipe length is then proposed. It is shown, that the distribution of the tangential residual stress does not depend significantly on the dimensions or ma-terial of the extruded pipe and a general equation is proposed to describe the distribution. This general distribution is then involved in the calculations of the pipe lifetime that are carried out using a method based on the linear elastic fracture mechanics. A significantly lower lifetimes are obtained when taking the residual stress into account.

This thesis describes proposal of a methodology for evaluating fatigue life of riveted joints. The first section summarizes the theory used to evaluate fatigue life, description of the structure of operation load spectra and construction principles for the design joints for optimum durability. The second part of the thesis focuses on the proposal of a methodology enabling analytical solutions in closed form suitable for the initial structural design and also numerical solutions for use in detailed analyzes of the structure. The applicability of the methodology is demonstrated on an example of analysis of a real structural detail and subsequent comparison of the analysis with available test results.

The aim of the thesis is to assess the influence of the exterior finish works on the total price of a house. The total price of the house consists of the interior price valuated by the cost method and the price of the exterior finishes which were valuated with the help of two methods: the cost method and the simplified method based on the Property Valuation Act. The valuation also covers several periods of time: a new building and 11-, 25-, 50-, 75- and 100-years-old buildings. The thesis focuses on the lifetime of individual parts of the exterior finishes—especially the time after which it is necessary to replace or reconstruct a part. A significant focus was placed on the percents listed in the Act and their correspondence to the actual state. The thesis also deals with the various methods of valuation and their appropriateness in each case. It also mentions the influence of other factors on the price of an estate (the use of different exterior finishes, or a selection of a building location) but these factors were not examined in detail.