National Repository of Grey Literature 117 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
The applications of the Human Biomonitoring Method for estimation of exposure and load of the Czech Population and International Comparison
Forysová, Kateřina ; Černá, Milena (advisor) ; Fiala, Zdeněk (referee) ; Mráz, Jaroslav (referee)
Human biomonitoring (HBM) is an important tool for monitoring human exposure to chemical pollutants from the environment and their possible adverse effects on the health of the population. HBM is defined as the monitoring and quantification of environmental chemicals, their metabolites or other changes related to exposure in human body fluids and tissues. The monitored biomarkers in this work are cadmium, mercury, cotinine and metabolites of phthalates. While mercury and cadmium are long-term biomarkers in the Czech Republic, cotinine and phthalate metabolites were determined for the first time. The presented work was a part of the pilot international study DEMOCOPHES, which focused on determining the exposure of increasingly susceptible population groups to the mentioned chemical noxas. In this work, the exposure of Czech children and their mothers living in urban and rural environments and the influence of environmental factors, lifestyle and social status on this burden were monitored. Another aim of the work was to compare the results of mercury and cadmium concentrations from the DEMOCOPHES project with the results obtained within the Health Monitoring System in relation to the population of the population in the Liberec Region in the years 1996 - 2016. The results showed that the levels of Cd...
Rotary part produced on CNC machine
Ratica, Filip ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
The diploma thesis contains an overview of the development of numerical control of machine tools and a historical excursion of the beginnings of numerical control. The work deals with the design and presentation of the component, and then the calculation documentation used to determine the load and safety of the component. After computational and design analysis, the work deals with the design of component production on CNC machines and the technological process of production. Finally, the production of the part is documented and evaluated.
Selection of an optimal tool for the selected machining technology
Podstata, Jan ; Jaroš, Aleš (referee) ; Fiala, Zdeněk (advisor)
This thesis compares the properties of four types of replaceable cutting tool inserts from different suppliers during milling. The comparative factors are cutting force, material loss of the insert and the roughness of the resulting surface. The thesis is divided into two parts - a comprehensive overview of the current state of knowledge and an experiment. The first part analyzes the load, the possibility of its measurement, surface treatment of tools, milling cutters and replaceable inserts. The experiment took the form of measuring the load during face milling, measuring the surface roughness of the machined material and measuring the material loss of the inserts on an optical strain gauge. The replaceable cutting tool inserts were compared based on the performed measurements.
Typification and unification of consumer products
Rumian, Dominik ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
This master’s thesis is focused on typification and unification of consumer products. Thesis focuses itself on analysis of typification and unification solutions used at chosen product which is optical disc drive. Author also adds his own ideas on how to further develop typification and unification and thus make production more effective. The last part of this thesis deals with the technical – economic assessment of the solutions used at chosen mechanics and author’s ideas.
Draft of spacer production technology
Zíka, Marek ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
The diploma thesis deals with the design of a new technological process for the production of a spacer ring with a diameter of 212 mm in cooperation with the company Meopta – Optika, s.r.o. The production of this component according to the current process does not comply with the prescribed geometric tolerances of flatness of the face and radius runout with a tolerance field size of 0.005 mm. The work is a detailed analysis of the specified component and describes the current technological process, including the machines on which the spacer ring is manufactured. Based on the knowledge gained from the analysis of the current process, a new technological process was created. During the production according to this process, some geometric tolerances were also exceeded, but the values exceeding the prescribed tolerance field were significantly reduced. The department of production technology found the results to be sufficient and the spacer ring will be produced according to the new technological process. In the last part of the work are the costs of production of components according to both processes.
CNC machining of shaft from gearbox
Konvičný, Denis ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
The diploma thesis deals with the production of gearbox shaft components using a CNC machine tool, shaft programming in Tebis 4.0 R8 software, Sinumerik SinuTrain 7.5, and manufacturing accuracy checking using 3D scanning technology, which allows you to compare the CAD model and the scan of the manufactured part.
Production of steam turbine shaft
Krška, Jan ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
The main aim of this bachelor thesis was to design the production of steam turbine shaft for machines tools that have „higher“ technical possibilies. Nowadays these „higher“ technical possibilities have machines which are controlled by computer, i.e. CNC machines. The introductory part of the thesis deals with steam turbines, including the steam turbine shaft. The following part of the thesis describes the production of this shaft on conventional machines. The production of the shaft includes, among other things, a technological procedure including used machines and tools. This is followed by a modern approach to production, using a CNC machine. The technological process is followed by the production of the shaft on reduced form. The final phase of the solution is devoted to technical-economic evaluation of the technology, including the financial aspects of the component and, last but not least, the impact of the technology on the environment. The final part of the thesis is extended by a discussion that evaluates this issue.
Design of technology production of SPD stop for bicycles
Tomek, Jiří ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
The bachelor thesis is focused on the design of shape and production technology of MTB clipless for bicycles. Autodesk Inventor software was used for modeling MTB clipless and SolidCam software was used for creating CNC program. The technology of production and description of used technologies were describe too.
Selected Nutrients in Etiology, Prevention and Treatment of Obesity
Sedláček, Pavel ; Müllerová, Dana (advisor) ; Rajdl, Daniel (referee) ; Fiala, Zdeněk (referee)
SELECTED NUTRIENTS IN ETIOLOGY, PREVENTION AND TREATMENT OF OBESITY The 21st century pandemic of obesity is given by to the obesitogenic environment that helps to develop a positive energy balance, where the energy intake of an individual chronically exceeds his energy need, ie energy expenditure. There is an increase in body weight by increased or abnormal body fat accumulation in the body. Preventing the development of obesity is aimed at achieving energy balance, in the case of existing overweight or obesity, the treatment lies in inducing and maintaining a negative energy balance for some time, ie stimulating energy expenditure and reducing energy intake. Selected diet determines not only energy intake, but its individual nutrients can also partially affect energy expenditure and fat tissue physiology. The aim of this work is to describe and experimentally verify some nutrients that could help in weight reduction and physiological function of adipose tissue. Based on the literature data, 19 active substances or mixtures were considered. A mixture of ω-3 polyunsaturated fatty acids (ω-3 PUFA), eicosapentaenoic acid and docosahexaenoic acid, in a daily dose of 0.6 g, in the form of fish oil in a certified food supplement was chosen as the most suitable for the experiment. In a 12-week, three-arm, parallel...
Improvement of manufacturing technology of flange
Dvořák, Jakub ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
This diploma thesis focuses on improvement of the existing technology of the flange part in cooperation with the company Znojemské strojírny, s r.o. The theoretical part describes the technologies used in machining of the component. Subsequently, cutting materials and aluminum alloys are dealt with. A detailed analysis of the existing technology is performed in the practical part of the thesis followed by rationalization of the production process, which was carried out with respect to time and financial savings. A new technological procedure is developed after the improvement of the current production process. Finally, a technical-economic evaluation of the design improvement process is carried out.

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