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A single-speed gearbox made by 3D printing
Hykolli, Denis ; Jaroš, Aleš (referee) ; Fiala, Zdeněk (advisor)
The aim of these theses was the creation of a single-stage gearbox by additive technology FDM / FFF. By chosen values was made dimension calculation for gears. The 3D model of the gearbox was designed in 3D software Autodesk Inventor. Single parts were produced on an FDM 3D printer by Prusa Research. Manufacturing programs for parts were prepared in PrusaSlicer. These programs were used for producing individuals parts on 3D Printer. Transparent material and printing parameters for the top of the gearbox were chosen by visual test and test of light intensity. The total cost of model production is calculated in the work. The result of these is a completely working model of a single-stage gearbox with a transparent top of the gearbox.
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Comparison of tensile properties of polymeric samples produced by extrusion based 3D printing
Krajcar, Ivo ; Vespalec, Arnošt (referee) ; Škaroupka, David (advisor)
The subject of this work is a summary of the contemporary knowledge about 3D printing and mechanical properties of a prototype manufactured this way. Main goal is to compare the frequently used FDM method with the innovative APF method of 3D printing from the Arburg company. ASA and CPE materials were chosen for researching this method. On these materials, tensile strength was measured. Aditionally, for comparison between the two methods, referential samples manufactured by injection moulding were made. A percentual difference in strength of each sample was compared against these. 60 samples in total were made for this comparison. After evaluation of the results, it was found that in the tensile strength the samples made by the APF method are approximately 30 % less strong than the referential sample. The samples made by the FDM method are approximately of the same strength as the referential sample.
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Testing of selected material properties for 3D printing
Čáslavský, František ; Mačák, Martin (referee) ; Vyroubal, Petr (advisor)
This thesis deals with 3D printing, materials used for 3D printing, testing of the materials and learning their real parameters. Goal of the thesis is comparing selected materials, executing series of mechanical test and selecting suitable material for printing high-quality plastic parts for use in automobiles, especially for reproduction of parts that are no longer made for oldtimers and for use in motorsport.
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Network protection testing and DoS attacks protection
Hanzal, Jan ; Šilhavý, Pavel (referee) ; Hajný, Jan (advisor)
The aim of this Master thesis is a testing of Cisco ASA\,5510 firewall with affect of Denial of Service attacks. Part of the thesis is a teoretical description some of the attacks and practical tests. Practical part covers basic testing of Cisco ASA with Spirent Avalanche 3100B. Number of TCP connections per second and firewalls throughput on 7th layer of ISO/OSI model were tested. Also the effect of Denial of Service attacks on the throughput. In a next part there is described one possible way how to generate Denial of Service attacks from a Linux server to the firewall. Python scripts were used for generation DoS packets. With those scripts it is possible to generate five types of attacks.
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Sintering of parts produced by 3D FDM printing
Koníček, Jan ; Fiala, Zdeněk (referee) ; Zemčík, Oskar (advisor)
This diploma thesis deals with the issue of sintering of parts produced by 3D FDM printing. The main aim of the work is the design of a sample part and the selection of suitable materials for testing. Subsequently, an experiment is carried out, which involves printing samples from different materials on a 3D printer and sintering them in salt powder at different time intervals. This is followed by examination of the surface after sintering and weight changes due to material degradation. Then a tensile test is performed to show changes in tensile strength of the tested materials and as the last part of the experiment, fracture surfaces are examined under a microscope.
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High Availability firewalls
Frátrik, Tibor ; Zeman, Václav (referee) ; Slavíček, Karel (advisor)
This diploma thesis is dedicated to researching the possibility redundancy of firewalls, especially commercial, software or hardware firewalls. The theoretical part describes individual firewalls and their redundancy options. The diploma thesis was more focused on two specific firewalls: ASA and Pfsense. As part of the practical part, topologies were designed and implemented for testing the redundancy of these firewalls. Dynamic address translations (NAT), VPN connection status, either site-to-site or remote-access VPN connections, and TCP connections were selected for testing. Finally, the results for individual firewalls were compared. Where it was mainly researched and compared, how the computer network reacts to redundancy in individual types of firewalls.
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Porovnání pevnostních charakteristik filamentů ovlivněných prostředím
ČECH, Jan
The thesis aims to create models using 3D printing from different filament materials, then expose them to selected environmental influences and evaluate their characteristical strength. This thesis contains a concise summary of 3D printing methods and their parameters in the theoretical part. Furthermore, a description of the properties of the materials used in the work. Specifically, the materials are acrylonitrile butadiene styrene (ABS), acrylonitrile styrene acrylate (ASA), Polylactic acid (PLA) and Copolyester (PETG). The practical part aims to create models using 3D printing and research the impact of the environment on these models. Experiments are conducted in room temperature, reduced temperature, elevated temperature, and UV radiation environments. Following these experiments, the models are subjected to a traction test and the results of this test are then compared. In the discussion part of the thesis, the results and some problems from the whole experiment are thereafter evaluated.
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Vliv technologie pěstování Leuzey saflorové (Leuzea carthamoides DC.) na kvalitu produktu
VYTISKA, Petr
The aim of this diploma thesis was to verify the effect of elicitors on the content of selected active substances in Leucea carthamoides DC. The elicitors used were acetylsalicylic acid and Nanophyte Si ? from AGRA GROUP a.s. Determined active substances were 20-hydroxyecdysone and Polypodine B. Evaluation was performed by UHPLC-MS / MS method. In conclusion, statistics of obtained results were performed.
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Vliv technologie pěstování kotvičníku zemního (Tribulus terrestris L.) na kvalitu produktu
NEUMANN, Jaroslav
This diploma thesis focuses on the Tribulus terrestris and its cultivation in order to achieve the highest content of biologically active substances. Tribulus has its roots in Chinese traditional medicine and Indian Ayurveda. The monitored substances are protodioscin and diosgenin. These two substances are saponins which are known for many beneficial effects on human health. For example, protodioscin is widely used as a remedy for conception problems. Diosgenin has its use in the fight against cancer. Both of these substances are also used in fitness to increase muscle mass and strength. The most famous is protodioscin, which became famous thanks to the Bulgarian weightlifters. However, the mechanisms of action of protodioscin and, in fact, diosgenin in the human body are not completely known in terms of influencing hormones in our body. In the practical part of this work, acetylsalicylic acid and the commercial preparation NanoFyt Si? are used as an elicitor. Water control was used for control, which was carried out in the same way as elicitor sprays. It is statistically summarized in what concentration the elicitors act or do not act. Based on statistical results, the cultivation procedure is recommended.
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The assesment of trombocyte function by optical and impendance agregometry
Malíková, Lenka ; Stiborová, Marie (advisor) ; Poljaková, Jitka (referee)
Introduction: Platelets have an important role in the process of haemostasis in which they form blood clot generation. In some cases it is necessary to suppress activity of platelets by antiplatelet drugs to prevent life threatening states. Acetylsalicylic acid (ASA) and clopidogrel can influence the mechanism of primary haemostasis by inhibition of platelet function. This process has to be controlled. Clopidogrel is used for prevention of thrombotic states. The active form of clopidogrel is formed by cytochrome P450 3A4. Clopidogrel binds to the receptor P2Y12 instead of ADP, so platelets cannot be activated. The effect of clopidogrel is very variable. It is known that there is unresponsiveness to clopidogrel in 5-30 % patients. Acetylsalicylic acid acetylates cyclooxygenase and blocks the conversion of arachidonic acid to tromboxan A2, so platelets cannot be activated. ASA treatment is effective, but in some patients can appear so called aspirin resistance (AR). Possible unresponsiveness to the therapy is the reason why it is suitable to monitor antiplatelet therapy, which may be provided by various methods. Thesis target: To detect normal range in measurement of healthy control group, evaluate efficiency of clopidogrel and ASA and to determine which method (LTA - Light Transmission Aggregometry...
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