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Issues of hammer die forging
Žižka, Jiří ; Štroner, Marek (referee) ; Podaný, Kamil (advisor)
This bachelor thesis deals with issues of hammer die forging which is technology that is mainly used for the production of shaped and height-versatile and rugged forgings with ribs and protrusions. Forgings are made by several blows of the tools which are called dies. Design of forgings is based on drawing documentation. For successful production of the component it is important to choose right forging temperature, parting line, required additions and tolerances. Hammers are machines which work with hit energy, they use kinetic energy for forming the material. Their characteristic features are good climbing of the material and filling deeper chambers in direction of the hit. Several types of hammers are used, for example fall hammer or double acting hammer and more.
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Optimization of gating systems (their yield) in Al castings made by investment casting technology
Žižka, Jiří ; Šmatelka, František (referee) ; Horáček, Milan (advisor)
This diploma thesis deals with the optimization of gating systems of shape-complex aluminum castings produced by investment casting process. Two castings whose massive gating systems make problem with the use of liquid metal (so called yield) were chosen for optimization. Each casting is described in its own chapter. The individual subchapters deal with description of the original and newly designed gating system. Simulation, test castings, X-ray inspection and metallographic examination were performed for each variant. At the end of each chapter there is an evaluation of the results of the optimization of gating system.
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Optimization of gating systems (their yield) in Al castings made by investment casting technology
Žižka, Jiří ; Šmatelka, František (referee) ; Horáček, Milan (advisor)
This diploma thesis deals with the optimization of gating systems of shape-complex aluminum castings produced by investment casting process. Two castings whose massive gating systems make problem with the use of liquid metal (so called yield) were chosen for optimization. Each casting is described in its own chapter. The individual subchapters deal with description of the original and newly designed gating system. Simulation, test castings, X-ray inspection and metallographic examination were performed for each variant. At the end of each chapter there is an evaluation of the results of the optimization of gating system.
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Issues of hammer die forging
Žižka, Jiří ; Štroner, Marek (referee) ; Podaný, Kamil (advisor)
This bachelor thesis deals with issues of hammer die forging which is technology that is mainly used for the production of shaped and height-versatile and rugged forgings with ribs and protrusions. Forgings are made by several blows of the tools which are called dies. Design of forgings is based on drawing documentation. For successful production of the component it is important to choose right forging temperature, parting line, required additions and tolerances. Hammers are machines which work with hit energy, they use kinetic energy for forming the material. Their characteristic features are good climbing of the material and filling deeper chambers in direction of the hit. Several types of hammers are used, for example fall hammer or double acting hammer and more.
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Ethical aspects of personal forms of marketing communication
Libovická, Lucie ; Pešek, Ondřej (advisor) ; Žižka, Jiří (referee)
This bachelor thesis point out transgressions against good manners in direct marketing and personal selling. Realized marketing research identifies consumers' opinions, attitudes and experiences with these forms of marketing communication. Current situation is described from received informations and main attention is paid to ethical problems occurring in direct marketing and personal selling. The data were obtained by written inquiring.
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Reasons of Prematurate Departure of Fireme's from Service Relation
ŽIŽKA, Jiří
ABSTRACT The thesis titled Reasons of Early Retirement of Members of Fire Rescue Service of the Czech Republic introduces Fire Rescue Service unit in the South Bohemia region, its role, its basic units, and operations. Further, I focused my attention on the personality of the fireman {--} rescuer and its features, as they are necessary for good performance when rescuing. Next part of the thesis describes history, major goals, and methods of work in Psychological service of Fire Rescue Service of the Czech Republic, established in order to prepare firemen professionally in psychological sphere, and in order to provide post traumatic care for firemen, their relatives, and also for the general public. The practical part is focused on the investigations of reasons bringing Fire Rescue Service members to retire early, which is often senseless. This investigation was focused on stress put on firemen during individual actions and how the stress affects firemen as well as how they are able to deal with it. There is also covered the fact, that psychological stress and also dealing with it to some extent, is not the only reason for the early retirement from the service. Amendments in the legislation belongs to the group of major reasons for leaving the service, namely the changes that followed after adopting the Act no 361/2003 Coll. ``The Act of 23rd of September, 2003 on the Service of Members of Security Units{\crqq} applicable since 1st of January, 2007. The Diploma Work could be used as the further lead for possible amendments in the legislation and in the system of the prevention of stress situations in members of Fire Rescue Service of the Czech Republic.
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Influence of hits with tragical consequences on the psyche of the fire men
ŽIŽKA, Jiří
Abstract In the theoretical part of my thesis I describe the Integrated Rescue System (IRS) in the Czech Republic, its function, basic components and the emergency committee function. I also focused the attention on the personality of a fireman and the fire management. I examined the determinants that are prerequisite for the successful crisis management performed by the IRS. In the following part of my thesis I refer to the history, the main commitments and operating methods of the psychological service of the Fire and Rescue Service Brigade of the Czech Republic. This service was established as a component of the professional preparation of firemen and for the event of providing the posttraumatic care for firemen, their family members and the public as well. The introductory chapter of the practical part deals with factors that diminish the working and expert potential of the fireman. Then I continue with the description of the tragic vehicle accident of a double-decker coach at Nažidla in the Český Krumlov area. The accident happened on March 8, 2003, and resulted in 20 fatalities. For my research I chose a quantitative method - the method of semi-conducted interviews, and then I analysed the data obtained. I conducted interviews with seven firemen who took part in emergency management of the vehicle accident at Nažidla. I asked them nineteen questions which I analysed subsequently with the intention to verify three hypotheses stated before. The analysis showed that: the immense tragedy marked the minds of the people involved both immediately and in the long term after the tragic accident: the following, unsystematic psychological care the participants of the accident were provided with proves to have had little effect. The tragic accident at Nažidla with all its consequencies enabled to formulate the conclusion that it is necessary to include the psychological preparation of firemen as a component of their regular training.
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