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Design of a 3D print head for mixing additives into cement mixtures
Vícha, Daniel ; Dočkal, Aleš (referee) ; Škaroupka, David (advisor)
The subject of the thesis is the design of a 3D printing head for cement-composite mixtures (concretes). The device enables the addition of the basic component of the mixture by using a liquid solidification accelerator, followed by active homogenization of the mixture and dosing at the printing site. 3D printing of cementitious mixtures often leads to a loss of buckling stability of the printout. Therefore, it is necessary for the printed material to contain additives that accelerate the solidification of the mixture. However, these additives can cause clogging of the hoses when the mixture is pumped into the print head due to premature solidification. Hence, a more suitable solution is to mix these additives in the print head itself. The objective was to develop a 3D print head that allows for homogeneous mixing of the additives in the mixture, thereby eliminating complications associated with pumping. A working prototype of the print head was designed, which consists of a mixing and extrusion chamber. The mixing efficiency of this prototype was verified through numerical simulations using Particleworks. Subsequently, the prototype underwent a mixture experiment without a solidification accelerator to investigate pumpability through the printhead. Based on the numerical simulations, it was determined that the proposed prototype provides sufficient homogeneity of the solidification accelerator with the cement mixture, which should resolve the issues associated with pumping the accelerated mixture. By having a separate mixing chamber, the mixing efficiency can be controlled by adjusting the speed of the motor that drives the mixing shaft. The print head was designed to allow extrusion to be interrupted during print head passes. This was achieved by extruding the mixture into the open space of the chamber using a screw feeder. Therefore, based on the conducted experiments and numerical simulations, it can be concluded that the developed print head has the potential to enhance the quality of 3D printing of cement mixtures and eliminate the problems associated with pumping.
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Possibilities of transmutation of spent nuclear fuel with advanced nuclear reactors
Ošust, Marek ; Brně, Dušan Král, Los Alamos NL a FEKT VUT v (referee) ; Katovský, Karel (advisor)
This bachelor thesis deals with the issue of transmutation of spent nuclear fuel. It describes the accelerator driven transmutator as well as its individual components. Examples of specific projects such as MYRRHA and CiADS are also given. The main objective of the thesis is the investigation of material properties of the spallation granular target. Compounds of heavy and light elements have been considered. Their physical properties, the number of neutrons generated by interaction with impinging proton beam and the resulting neutron energy spectrum were compared. The calculations were performed using the TALYS program.
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Control Electronics for Electromagnetic Ball Accelerator
Dočkal, Tomáš ; Harvánek, Michal (referee) ; Král, Jan (advisor)
The goal of this bachelor's thesis was the design and implementation of an electromagnetic accelerator for a steel ball in a closed circular track. Electromagnetic accelerator serves as a demonstrator of particle accelerator functionality and as a game with the aim of engaging students in the study of electrical engineering. The work includes designing the coil using an algorithm in Matlab, which optimizes parameters to achieve maximum magnetic field intensity while considering limited power loss and voltage. The power electronics were designed and the functionality of the circuit concept was verified through simulation. The printed circuit board (PCB) for the power electronics, which also includes the control unit, was designed in KiCad. The system incorporates both passive and active cooling and is equipped with temperature sensors to ensure safe operation. The control part of the system was designed using the ESP-WROOM-32 development module, which allows for remote control and monitoring via a web interface. Optical sensors were designed to enable precise detection of the ball's position and speed. The mechanical part includes the fabrication of the coil frame and the mounts for the optical sensors using 3D printing. The PCB, along with the power supply, was mounted in a casing.
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Accelerator driven nuclear reactor neutron field parameters determination
Zemčíková, Kristína ; Šťastný, Ondřej (referee) ; Katovský, Karel (advisor)
The master thesis deals with calculation of neutron field parameters in systems controlled by an accelerator called the Accelerator Driven System (ADS). Firstly physical principle is described, along with its parts as well as the history and present of ADS projects worldwide. Subsequently, neutron activation analysis and gamma spectrometry are described in more detail. The experiment on AmBe neutron source and on Microtron MT25 is presented in the experimental part. Lastly, the reaction rates are calculated.
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Performance Evaluation of Graphics Accelerator
Vanek, Juraj ; Drábek, Vladimír (referee) ; Herout, Adam (advisor)
My work is about performance evaluation of graphics accelerator by 3D scenes rendering. It focuses on how to test the performance of the accelerator from every point of view during the performance critical operations in 3D graphics. It deals with implementation problems of individual measures, their influence on total results and evaluation of the measurements. The final output of the application is a score, by which is possible to judge what performance is giving the accelerator in comparison with others. For this comparison is available an on-line results database.
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Performance Evaluation of Graphics Accelerator
Vanek, Juraj ; Jošth, Radovan (referee) ; Herout, Adam (advisor)
This paper deals with possibilities and functions of modern graphic accelerators and with measuring performance under OpenGL interface. Widespread algorithms to render scene in real-time are used. It focuses on how to test every part of accelerator's graphic pipeline as well as measure performance in rendering of advanced effects and theoretical speed at general purpose calculations through graphic processor. This testing is realized by implementing multiple test series and their further evaluation. Final application enables setting of test parameters and outputs a score, by which is possible to judge accelerator's performance in comparison among themselves.
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Accelerator Driven Nuclear Power Plants
Jarchovský, Petr ; Krása,, Antonín (referee) ; Katovský, Karel (advisor)
This bachelor’s thesis deals with utilization of spent nuclear fuel in nuclear power plants of new generation – accelerator driven nuclear power plants and of conversion of this fuel into electrical energy. In the introduction are listed basic physical and theoretical knowledge of nuclear reactors along with their basic division and global distribution. As another point accelerator driven systems are described with their brief development and the basic concept and usage on both the nuclear power plants and transmutation technologies. Some global projects are mentioned here dealing with this system and conduct research. More into detail is point about European projects MYRRHA and ESS, because there are important research facilities worldwide. The next are projects with liquid target as a very promising medium. The last part deals with the calculation of basic parameters of ADS in the MCNPX and its applying.
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The Issue of testing shotcrete
Škapová, Pavla ; Hela,, Vlastimil (referee) ; Hubáček, Adam (advisor)
The master‘s thesis focuses on testing the shotcrete prepared in laboratory conditions. The main observed properties are compresive strenght of shotcrete and modulus of elasticity. The aim is assessment of methods for measuring those parameters. The calibrating correlations for strenght characteristics of shotcrete are given by obtaining the results of used methods. The shotcrete composition, amount and type of accelerating additive as well as economic aspect of using shotcrete is also assessed.
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A Hardware-acceleration Protocol Design for Demanding Computations over Multiple Cores
Bareš, Jan ; Dvořák, Vojtěch (referee) ; Šťáva, Martin (advisor)
This work deals with design of communication protocol for data transmission between control computer and computing cores implemented on FPGA chips. The purpose of the communication is speeding the performance demanding software algorithms of non-stream data processing by their hardware computation on accelerating system. The work defines a terminology used for protocol design and analyses current solutions of given issue. After that the work designs structure of the accelerating system and communication protocol. In the main part the work describes the implementation of the protocol in VHDL language and the simulation of implemented modules. At the end of the work the aplication of designed solution is presented along with possible extension of this work.
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