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Use of laser-TIG hybrid technology for welding of different materials used in power engineering
Žák, Tomáš ; Beran, David (referee) ; Mrňa, Libor (advisor)
Thesis is focused on analyzing the influence of preheating process parameters using electric arc from TIG torch during laser welding on weld properties of stainless steel and carbon steel with higher strength. In this thesis experiment was done in which metal sheets 3 mm thick from X12Cr13 and S355 steels were welded. Welding was done first with using only laser, then laser with TIG preheating and lastly laser with preheated material by induction heater. When TIG preheating was used than set welding current was changed on the power source. The welds were subsequently evaluated based on macrostructure, microstructure and Vickers hardness test.
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Welding of materials for the production of energy devices with laser and laser-MIG hybrid technology, hybrid welding
Mrňa, Libor ; Šebestová, Hana ; Novotný, Jan ; Beran, D.
Laser welding technology is known more from the automotive field, where it is used for fast and high-quality welding of thin body sheets. The production of power equipment is specific both in the materials used (mainly martensitic stainless steels) and in the significantly larger thicknesses of the welds. Research into the weldability of these materials using laser welding technology and laser-MIG hybrid technology is being conducted at the ÚPT. The article describes experiences with the general weldability of these materials with laser and hybrid laser-MIG, as well as practical applications of welding parts of steam turbines. Finally, the possibility of welding stellites using hybrid laser-MIG technology is also discussed.
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Urban community garden "Smetanka" in years 2014-2017: reasons to gardening, a conflict and the over
Beran, David ; Novák, Arnošt (advisor) ; Čada, Karel (referee)
This thesis is based upon the phenomenon known as urban community gardening, and examines it with regards to conflicts within an intended environment. The theoretical section is based on a school of thought that holds nature as something that exists in both science and humanities, and which can be observed within the social world. As opposed to nature and society being divided, this part will address the term 'socionature', which comprises a current post-anthropocentric stream of humanities and social sciences. Essentially it stays on the theory of conflicts. The research posits answers to the question of how gardeners justify and reasonably support their activities at an urban community garden called "Smetanka garden" in Vinohrady, Prague. Two of the outcomes were: the cultivation of strong neighbourly relations; and encouragement of recreational family outings. The Smetanka garden was closed in 2017. The thesis sees the conflict that occurred around the closure as a socionatural conflict. One question is, what were the arguments for closing the garden? The main argument stated that the land should be used for construction of sports facilities to serve the schools nearby. Furthermore, the community garden was only meant to be temporarily from the beginning. Proponents maintained that the garden...
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Specific aspects of sector public procurement
Beran Kulhavý, Daniel ; Horáček, Tomáš (advisor) ; Liška, Petr (referee)
1 Specifics aspects of sector public procurement Abstract This diploma thesis describes the Czech legal regulation of sectoral public procurement. The aim is to provide a comprehensive view of this issue. Legislation of sectoral public procurement is a sector of public procurement law which is also specific in that it also affects private entities. The thesis is divided into two basic parts. The first part describes the key topics of awarding sectoral public procurement. There is described the principle of determining the sectoral public contract, the difference of this concept compared to the previous legislation, the identification of persons who can become public contracting authorities and the definition of other terms that are typical for sector public public sector contracts. Furthermore, the issue of relevant activities in the gas, heating, electricity, water, transport, land use areas, airport and port services, postal services and mining is described in detail. The analysis of related case law is also described in the context of determining relevant activities. The second part analyses the special provisions for the award of sectoral public contracts public sector contracts, which is regulated by special provisions against the general regime. Particular attention is paid to the exceptions for...
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Use of laser-TIG hybrid technology for welding of different materials used in power engineering
Žák, Tomáš ; Beran, David (referee) ; Mrňa, Libor (advisor)
Thesis is focused on analyzing the influence of preheating process parameters using electric arc from TIG torch during laser welding on weld properties of stainless steel and carbon steel with higher strength. In this thesis experiment was done in which metal sheets 3 mm thick from X12Cr13 and S355 steels were welded. Welding was done first with using only laser, then laser with TIG preheating and lastly laser with preheated material by induction heater. When TIG preheating was used than set welding current was changed on the power source. The welds were subsequently evaluated based on macrostructure, microstructure and Vickers hardness test.
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The research of biathlon among students of FTVS UK
Beran, Dominik ; Janák, Vladimír (advisor) ; Štědroň, Bohumír (referee)
Title: The research of biathlon vieweship among students of FTVS UK Objectives: The objective of this bachelor thesis is to provide data on the basis of marketing research about biathlon viewership among students of FTVS UK. Contribution of this thesis should be providing useful insight related to viewership and interest into biatlon for this group. This data could set a basis for a deeper reasearch in the foreseeable future. Methods: This thesis uses the method of quantitative research. The selection of the respondents was done by partially influences selection and the minimal sample size was set to at least seventy five respondents. Electronic questioning was used to collect the primary data. Results: According to the research results, nearly 86 % of the respondents had shown interest into biathlon. It was also found out, that vast majority of them has been watching biathlon races via ČT sport channel. More than 78 % of the respondents follows biathlon content on social networks. According to respondents, the two most important factors of biathlon broadcasting are quality commentary and quantity of commercials. Keywords: marketing research, media, viewership, biathlon
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