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Physical and chemical properties of FINEMET-type alloys
Zábranský, Karel
FINEMET-type alloys Fe80Nb3Cu1B16 (FM1), Fe80Nb3Cu1Si6B10 (FM2), and Fe33,5Ni40Nb3Cu1Si13, 5B9 (FM3) are investigated in the amorphous states. The aim of these studies is to follow an influence of variations in metalloid (Si, B) and metal (Fe, Ni) elements on the structural, magnetic, chemical, and mechanical properties.
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The structural and the fundamental mechanical properties of intermatallics on the base of TiAl
Krahula, Karel ; Dlouhý, Ivo
Gamma TiAl alloys are emerging as a pervasive structural material. Remarkable progresses have been made through refining lamellar microstructure and grains, microalloying, chemistry modification, process development and/or their combination. The main thrust was to enhance resistance to creep deformation, oxidation and high cycle fatigue deformation/failure. Less or even no knowledge have been obtained in the field of the intermetalics fracture at uniaxial or bending loading, there are missing data about their behaviour at the presence of cracks and other defects. The reason is simply in the other properties that are key from application point of view. Due to their brittleness at temperature close to room temperature the investigation of the intermetalics fracture is complicated but promissible provided it bring ideas for the further development of the alloying and microstructure. The paper is focused on the first steps in this field.
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Influence of handball on the shoulder girdle state
Zemanová, Monika ; Nováková, Pavlína (advisor) ; Hošková, Blanka (referee)
Title: Influence of handball on the shoulder girdle state. Goal of the project: Examine and evaluate of functional condition of shoulder joints of young handball players on various player positions between input and output investigation. Suggestion of strengthening and stretching exercises for the area of shoulder girdle and finding if the exercises has some influence on the shoulder point as well as on the player performance. Method: We made comparison of input and output test results by the method of "kvasiexperimental" qualitative study. A modified questionnaire was given to each player before input investigation. Based on the questionnaire we learned deviations from the function, eventually the pain in the area of shoulder joint. After input investigation strengthening and stretching exercises of the shoulder girdle for 13 handball players on the various player positions in the youth team of Dukla Prague were suggested. Results: Results of the investigation of shoulder girdles in the group of handball players did not prove large number of subjective symptoms in the sense of pain and limitation. During clinical examination we also did not learn on any player results pointing the suspicion on expressive structural disorder of the monitored area. However the number of functional changes was...
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Sizing of the waves geometrical parameters fabricated on the sheet metal die
Stupárek, Daniel ; Forejt, Milan (referee) ; Samek, Radko (advisor)
This thesis approaches the problem of the return of the original geometric shape of the wave which is created on die panels. Die is used as a structural feature of the fiber-cement roofing material in its shipment in the production line. Based on the study of the theory of cold formed sheet metal determine the actual status in the plant. The method of calibration was designed from the collected informations about the original manufacturer of sheet metal panels. Under this proposal and calculation of the required forming power for the recalibration wave in the factory device for the die calibration was designed and constructed. Equipment calibration was performed on two types of corrugated panels and the result fulfilled the theoretical assumptions. In conclusion is processed technological-economic evaluation and the accompanying drawings.
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Manufacturing of separation subrack for rolling stand.
Trčka, Libor ; Štyl, Pavel (referee) ; Daněk, Ladislav (advisor)
The project elaborated in terms of engineering studies concern with project of a manufactural process of separator weldment and of an economical analysis of a production calculated for one item of a weldment and one item of a casting. During elaboration this project there were used all obtainable norms and technical bibliography. In literery studies there are summarized important knowledges related to welding constructions, welding technology, heat treatment and checking fusion splices. There was choosed box construction for this separator weldment. That is designed of two types of material. First of materials S355J2G3, EN 10025 is used for structural parts and the second material S235JR, EN 10025 is used for stiffering pars. The propriety checking of this construction and used materials was performed by Finite Element Method. After calculating costs of production of both variants we can say, that the costs of production of one piece seperator weldment are considerably lower, than costs of production of one piece of casting.
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Instrumentovaný indentační test v nano- a mikroměřítku
Buršíková, V. ; Buršík, Jiří ; Bláhová, O. ; Dušek, J. ; Navrátil, V.
Several materials were chosen to span a wide range of hardness and structure,including pure copper,nickel,titanium,cadmium,zinc and silver.Nanoindentation hardness and microhardness values in wide interval of loads,measured by DSI method and classical Vickers microhardness method were compared in view of indentation Size Effect.
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Influence of a particullar heat on properties and structure of duplex steel welded joint
Němec, Karel ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
The research project is focused on an influence of a particullar heat on properties and structure of duplex steel DIN 1.4462. Samples prepared by using different welding speeds 10, 15, 20, 25, 30 cm.min-1, were tested for tensile, metalographical analysis and hardness test. Experimental results proved the optimal welding speed for material with 2 mm thickness to be 15 cm.min-1. Usage of lower speed 10 cm.min-1 led to formation of hot cracks while higher speeds 20, 25, 30 cm.min-1 didn‘t cause material penetration.
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Jednoduchá numerická simulace vnitřní struktury částicového testu
Bartušek, Karel ; Fiala, P.
The basic configuration of the electron beam was verified in Institute of Scientific Instruments Academy of Sciences of the Czech Republic experimentally. We prepared the numerical model which is based on the particle theory. Actually, it respects classical Electrodynamics Material Wave Theory (MWT). Numerical results were evaluated. The second model was prepared in respect to theory of wave packet (Louis de Broglie) and solved again. Results of both models were the same in their quality, we evaluated electric field intensity E on the electron impact area, and they corresponded with results from experiments.
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Laboratory exercises in NS3 enviroment for Advanced communication technology course
Vadkerti, Gabriel ; Mašek, Pavel (referee) ; Langhammer, Lukáš (advisor)
This master thesis deals with creating laboratory exercises for students in simulator NS-3, where the IPv4 and IPv6 protocols, unicast and multicast transmission types, quality of services in wireless networks, furthermore protocols TCP and UDP are analyzed. The first section describes the NS-3 network simulator, the Eclipse development environment and the method how to connect them. In the next section protocols IPv4 and IPv6 are presented, the structure of the headers and the technique of fragmentation are described in detail. Based on this a laboratory exercise is created which deals with comparison of protocols IPv4 and IPv6. In the next section the types of transmissions are described, furthermore the multicast transmission type is explained more in detail. In the next practical section the second laboratory exercise is created, which deals with comparison of unicast and multicast transmission types. The subject of the following section is ensuring quality of services in data networks, the EDCA access method is discussed more in detail. In the next section the EDCA access method is implemented in a simulation as a laboratory exercise, in which the impact of the access category of EDCA to different transmission parameters is investigated. The next section deals with protocols TCP and UDP, furthermore with the structure of their headers. In the last section a laboratory exercise is created, in which the properties of the protocols TCP and UDP are compared.
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Experimental Investigation of Integrated Thick Films
Čejka, Marek ; Jankovský, Jaroslav (referee) ; Szendiuch, Ivan (advisor)
This bachelor thesis deals with the theory of thick film technology. It describes implementation of thick layer integrated circuits, thick film technology, creen printing method. It includes basic electrical properties of thick layers. The aim of this work is the experimental work deals with the detection of current rating of conductors. The work includes the design of method of measuring and test structure.
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