|
| |
|
|
Manufacture of knives and their heat treatment
Bukvic, Tomáš ; Doležal, Pavel (referee) ; Němec, Karel (advisor)
This bachelor thesis deals with manual small series production of knives. It presents an overview of used cutlery steels and ushers their characteristics. It deals with the choice of blade geometry and material for a particular knife application. Furthermore, it initiates into the issue of heat treatment of knives, which is absolutely necessary for their functionality. The conclusion includes the documentation of the kitchen knife manufacturing process, which was made for the purpose of this thesis.
|
|
|
Unconventional methods of welding of wrought magnesium alloys
Klimčáková, Kateřina ; Mrňa, Libor (referee) ; Doležal, Pavel (advisor)
Master's thesis deals with consideration possibility of conventional and unconvetional welding methods of wrought magnesium alloys. Methods of Friction Stir Welding, Pulsed Nd:YAG laser and Continuous Fiber laser was used to join magnesium alloy sheets AZ31, AZ61, ZE10 and ZE41. For studying influence of processing parameters on microstructure and mechanical properties were used methods of light microscopy, scanning electron microscopy, tensile tests and microhardness measurements. The results of tensile tests show that from the point of view of keeping ultimate tensile strength is the best methods for welding magnesium alloys Friction Stir Welding. Compared with Nd:YAG laser, fiber laser give better properties of welds. From comparing microstructure and mechanical properties . It wasn't found publications about Friction Stir Welding of magnesium ZE alloys or about FSW sheets with thickness only 0,8 mm and 1,6 mm.
|
|
|
HiFi DA Converter with Integrated Headphone Amplifier
Doležal, Pavel ; Jaroš, Jiří (referee) ; Šimek, Václav (advisor)
This thesis is dealing with a design and fabrication of D/A coverter and headphone amplifier for stereo reproduction in Hi-Fi class. In opening chapter, overall problematics of digital audio signal distribution is discussed. Following chapters are dedicated to converter design, communication protocols, component selection, converter production, circuitry design and firmware programming. The final chapter is dealing with expansion options such as HDMI inputs and surround sound.
|
|
|
Structure and mechanical properties of magnesium materials prepared by SPS
Pleskalová, Kateřina ; Hutařová, Simona (referee) ; Doležal, Pavel (advisor)
This diploma thesis deals with the processing of the magnesium-based powder materials with the addition of zinc by the spark plasma sintering. The aim of this thesis is to evaluate influence of sintering parameters and zinc content on the microstructure and mechanical properties of the material. First part of the thesis is literary research which is divided into two main chapters. The first chapter describes magnesium-based materials and mentions their use as biomaterials. The second chapter discusses powder metallurgy, specifically magnesium powders and spark plasma sintering. In the experimental part the powders were sintered at temperatures 300 °C and 400 °C and an analysis was performed using optical microscope, scanning electron microscope, then also EDS analysis and hardness, microhardness and three-point bending tests were performed. An increase in hardness was observed with increasing zinc content and with increasing sintering temperature. The flexural strength was higher for materials sintered at a temperature of 400 ° C.
|
|
|
The DPDK DNS Probe Application Extension
Doležal, Pavel ; Kučera, Jan (referee) ; Vrána, Roman (advisor)
This master's thesis is focused on extension of the DPDK DNS Probe application that monitors DNS traffic in high speed networks. It presents framework DPDK, which can be used for fast packet processing. General architecture of the DNS system is described as well as details of its components. Basic principles of transport protocol TCP are described. It introduces an effective design and implementation of DNS packet parsing to optimize DPDK DNS Probe's performance. It also introduces a design and implementation of processing DNS messages sent over TCP for export of traffic statistics. The application's performance was tested using a high speed traffic generator Spirent.
|
|
|
Evaluation of corrosion resistance of magnesium alloy AZ61
Hlavnička, Jiří ; Horynová, Miroslava (referee) ; Doležal, Pavel (advisor)
This work is foccused on assessment of corrosion resistivity and character of corrosion attack of AZ61 magnesium alloy. Squeeze casting specimens in both as-cast state and in solution annealing state were used as the experimental material. Corrosion degradation was performed in a salt spray fog (5% solution of sodium chloride). Mechanism of corrosion, appearance and depth of corrosion attack have been evaluated.
|
|
|
Badminton rackets
Kuriál, Jakub ; Doležal, Pavel (referee) ; Molliková, Eva (advisor)
The fundamental topic of this thesis is the analysis of materials used in the production of sports equipment for badminton. The thesis describes the evolution of materials used in the context of the historical development of the game system. The thesis explains the game principles and the requirements for the technical characteristics of the gaming equipment. The thesis deals primarily with material properties of individual parts of the badminton racket (frame, string bed, wrap) but it also mentions the demands on the ball or the playing surface. In the final section of the thesis the expected development in the sports industry using the acquired knowledge is described. The most likely direction seems to be the area of nanotechnology. The importance of this work lies in the complete discussion of a topic in the field of material sciences which has not been composed yet.
|
|
|
Unconventional methods of processing materials for knives
Bražina, Jakub ; Němec, Karel (referee) ; Doležal, Pavel (advisor)
This thesis focuses on the issue of unconvetional cutlery materials, their application for production, and the processing of a hunting knife. The readers are aquainted with cutlery issues in the search section, where the basic characteristics and properities are written. The next part describes the various metallic and non-metallic materials and their possible properities of processing and production. This thesis also deals with the surface protection of these cutlery materials. The second main part describes construction design, material selection, heat treatment, and with surface treatment of the hunting knife.
|
|
|
Present Trends of Methods for Hardness Measurement
Brzobohatý, Tomáš ; Doležal, Pavel (referee) ; Hutařová, Simona (advisor)
Purpose of this thesis is created view of present methods of hardness measurement and to describe them in more detail. Firstly this thesis deals with representatives of standard and for many years used methods of hardness measurement and hardness evaluation which are used today, too. Secondly this thesis is focused on modern methods, and their successful working experience is question of time.
|
guest ::
RSS feed.