Study of Surface Steels after Heat-Chemical and Electrochemical Treatment

Import 23/08/2017PECHA, R. Studium povrchu oceli po tepelně-chemické a elektrochemické úpravě. Ostrava: Katedra mechanické technologie, Fakulta strojní VŠB – Technická univerzita Ostrava, 2017, 39 s. Bakalářská práce, vedoucí: Podjuklová, J. Bakalářská práce se zabývá příčinami neúspěšného zlepšování vlastností povrchu ložiskových klecí a autor se snaží vyvodit příčiny nevyhovujících rozměrů ložiskových klecí po karbonitridaci. Autor se snaží navrhnout alternativní řešení a pomocí experimentálních prací ukázat, že je navrhované řešení vhodné a výhodné jako řešení problému.PECHA, R. Study of Surface Steel after Heat-Chemical and Electrochemical Treatment. Ostrava: Department of Mechanical Technology, Faculty of Mechanical Engineering VŠB – Technical University of Ostrava, 2017, 39 p. Bachelor thesis, heads: Podjuklová, J. Bachelor thesis deals with causes of unsuccessful improvement of surface properties of bearing cages and the author attempts to deduce the causes of unsatisfactory dimensions of bearing cages after carbonitriding. The author tries to suggest an alternative solution and, using experimental work, to show that the proposed solution is an appropriate and advantageous solution to this problem.345 - Katedra mechanické technologievelmi dobř

Religion as an Unemployment Insurance and the Basis of Support for Public Safety Nets: The Case of Latin America and the Caribbean

This paper explores the role of religion in mitigating the degree to which unemployment reduces subjective well-being and it examines its support of social programs. The paper goes beyond existing literature in three ways: It extends existing literature to Latin America and Caribbean countries; it explicitly includes analysis of two confounders (social capital and personal traits) ignored in existing literature; and it moves beyond correlation by using the propensity score method to tease out a causal relation between religion and well-being. We find that religion acts as a buffer: Unemployed religious people are relatively happier than are nonreligious unemployed people. However, in contrast with the existing literature, we find that religious people are relatively more supportive of public social policy

The Acute Effect of Exposure to Barefoot Running on VO2 Peak, Fatigue, and Time to Exhaustion in Recreational Runners

Please refer to the pdf version of the abstract located adjacent to the title

An Alternative Method to Deduce Bubble Dynamics in Single Bubble Sonoluminescence Experiments

In this paper we present an experimental approach that allows to deduce the important dynamical parameters of single sonoluminescing bubbles (pressure amplitude, ambient radius, radius-time curve) The technique is based on a few previously confirmed theoretical assumptions and requires the knowledge of quantities such as the amplitude of the electric excitation and the phase of the flashes in the acoustic period. These quantities are easily measurable by a digital oscilloscope, avoiding the cost of expensive lasers, or ultrafast cameras of previous methods. We show the technique on a particular example and compare the results with conventional Mie scattering. We find that within the experimental uncertainties these two techniques provide similar results.Comment: 8 pages, 5 figures, submitted to Phys. Rev.

A SIMPLIFIED APPROACH FOR SOLUTION OF TIME UPDATE PROBLEM DURING TOXIC WASTE PLUME SPREADING IN THE ATMOSPHERE

Reliable and up to date information represents principal prerequisite for effective management of intervention operations targeted on emergency situations during accidental releases of harmful substances into the atmosphere. Promising way of this trend insists in development of assimilation techniques for improvement of model prognosis reliability on basis of optimal blending of predictions with observations incoming from terrain. In this paper we are concentrating on the forecast procedure which generates the new state predictions from the initial conditions standing for previous time. Two problems are encountered here. At first, the resulting predictions from the previous time step can be assimilated with incoming data before the next time predictions are evaluated. The initial conditions for the next time are then modified in advance and trajectory information accumulated from the same beginning can become fuzzy. So, the trajectory models can have troubles how to propagate plume in the next time. At second, reliable and up to date information at medium distances from the source of pollution represents basic inevitable conditions for effective management of intervention operations targeted on consequence mitigation during emergency situations. But justifiability of Gaussian plume model application in medium range distances is questionable. A simplified solution offers segmented Gaussian plume model (SGPM) which can account stepwise for the time dynamics of the admixture release and hourly changes of meteorological conditions. The extension of modelling to medium distances is facilitated by availability of the new quality of gridded spatial short-term meteorological forecasts. The Czech meteorological service provides 3-D data in ALADIN format for medium domain 160 km × 160 km around each nuclear power plant (NPP) in the Czech Republic. In the following text we are describing the SGPM application in longer distances taking into account the new gridded meteorological predictions. The comparison with former methodology is illustrated on one real meteorological situation from June 25, 2008

Experimental Production of Mechanical Microwave Components by Additive Manufacturing

Diplomová práce se zabývá využitím technologie aditivní výroby tvarově složitých součástí, používaných v telekomunikační technice. Teoretická i experimentální část byla zaměřena i na proveditelnost některých povrchových úprav. Byly vyrobeny dvě demonstrační součásti. První byla 11 GHz průchodka vyrobená metodou SLM z nerezové oceli 316L. Druhý byl 24 GHz filtr vyrobený z hliníkové slitiny a následně pokovený vícevrstvým povlakem s vrchní vrstvou stříbra. Experiment je doložen výsledky měření na spektrálním analyzátoru. Vzhledem k očekávanému rozvoji sítí i využití družic pro telekomunikační účely bylo nezbytné vyhodnotit možnosti komerčního využití s cílem dosažení potřebných úspor nákladů výroby i investic.Master thesis covers the usage of additive manufacturing technology on complex shape components that are used in telecommunication technology. Both theoretical and practical parts were scoped also on feasibility of some surface treatments. There were manufactured two demonstrating components. First of them, it was manufactured 11 GHz bushing from stainless steel 316L by SLM method. Last one was a 24 GHz filter, which was made of aluminum alloy and then it was plated by a multilayer coating with upper layer of silver. The experiment is documented by measurement results on a spectral analyzer. With respect to predicted development of networks and the usage of satellites for telecommunication purposes it was necessary to evaluate options of the commercial usage with the aim of achieving required savings in production and investment costs.346 - Katedra obrábění, montáže a strojírenské metrologievýborn

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Tato bakalářská práce pojednává o využití mikropočítače Beagleboard–xM pro domácí použití.This bachelor’s thesis shows embeded system Beagleboard–xM for home used.