National Repository of Grey Literature 220 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
PCBs Cleaning Process Optimization
Smejkal, Jakub ; Tichopádek, Petr (referee) ; Starý, Jiří (advisor)
The diploma thesis introduces readers to the issue of PCB cleanliness by a short analysis of historical approaches to their cleaning. The theoretical part defines what phenomena occur in case of leaving impurities on the PCB and names the different types of impurities with a focus on fluxes. It also deals with types of cleaning fluids and selected technologies suitable for PCB cleaning, including research of specific products and their manufacturers. The practical part analyses the current state of washing processes in the company TESCAN Brno, s.r.o and performs the initial cleanliness test of PCBs from external suppliers and internally assembled PCBs. Based on the performed analysis, the work then focuses on the replacement of the current cleaning fluid and the optimization of the used solder. In connection with the process and results of a series of test measurements performed in both monitored areas, work proposes a methodology for evaluating the current applicability of the cleaning liquid and for testing the surface insulation resistance.
Complex Production Line for Through Hole and Surface Mount Components Assembly from energy saving point of view
Tomanček, Maroš ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
Thesis deals with analysis of electronic assembly line from an energy consumption point of perspective. The throughput rate is observed along with consumption of individual devices from the chosen assembly line at Resideo company. The work load balance of the assembly line was evaluated by cycle time analysation. Electrical power and losses were measured with the use of power logger and a thermal camera. The possible energy saving solutions are then concluded from analysis and comparison of power drawn by the devices. Use of low temperature solder alloys and other modern industry solutions were considered with recommendation to be used in the field.
Fuzzy decision models
Starý, Josef ; Karpíšek, Zdeněk (referee) ; Žák, Libor (advisor)
This master's thesis is focused on fuzzy decision-making using fuzzy inference systems. In the first part, the math theory necessary in this field is described. The main objective of the thesis is to create a fuzzy inference system with adaptive cruise control function. Mathematical software MATLAB is used to accomplish this goal. The system evalutes situations and decides on the vehicle's response based on input variables such as the vehicles's speed, the speed of the previous vehicle, and the distance between vehicles. Its functionality is tested in this thesis using simulations of fictional scenarios, and then the system is compared to real adaptive cruise control systems using real data.
Influence of Different Microetchants in Examination of Intermetallic Layers Morphology
Sčensný, Ľudovít ; Bayer, Robert (referee) ; Starý, Jiří (advisor)
This bachelor’s thesis deals with the problematics of micro-etchants and their composition. The suitability of different solutions intended for observing morphology of intermetallic compounds in a soldered joint is examined. Three surface finishes coated with solder alloys are used to form representative samples. The prepared and processed samples in the form of a metallographic specimen are subsequently suitable for examining the microstructure of the etched surface. Laser scanning microscopy is used to analyse and evaluate morphology of the shown intermetallic compounds.
Set possible causes for capacity loss of capacitors
Fabiánek, Marcel ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This thesis deals with formation of defects on through-hole capacitors. Process of wave soldering and its steps are described in the first part. The listing and description of possilble defects caused by wave soldering is followed after the first part. There are several sources of potential causes of capacity loss and a separate chapter to these causes. The last part contains a proposal of testing individual potencional causes. Their purpose is to reveal the root causes of formation of the defects and then the practical solution is described.
Bismuth Low Temperature Solder Pastes
Hájka, Jan ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
This bachelor thesis deals with low-temperature solder pastes with different bismuth content. It focuses on material, process and environmental influences that affect the reliability of the soldered joint. The practical part investigates the effect of isothermal aging and thermal cycling on the mechanical properties of solder joints formed by an eutectic tin-bismuth alloy. Furthermore, tin-bismuth solder pastes are compared to pastes with additives (TiO2 nanoparticles) and to SAC305 alloy. Technical adjustments are made to the measuring device in order to increase the accuracy of the measurement.
IoT Manual Soldering Station and Technology Aspects
Němec, Ivo ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This thesis explores the Internet of Things, its applicability in soldering stations and its possible benefits in terms of quality control of the manual soldering process. The thesis summarizes the basic description of IoT, its historical development, possible threats and today's implementation in various devices. Furthermore, the principle of soldering stations and the IoT features implemented in them are described. Last but not least, possible benefits of IoT applicability in soldering stations are presented, such as services to make the manual soldering process more traceable and controllable.
The Solder Alloys Combination and Influence on Solder Joint Properties
Bedlivý, Michal ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Solder joints, solder alloys, low melting point solder aloys, solder joint mechanical strength, resistance of solder joints.
Immersion Tin Surface Finish of PCB
Karzel, Vítězslav ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
The aim of this work is to study and more deeply understand everything about surface finishing of the printed circuit boards, that are used for lead-free soldering. Mainly we should focus on immersion tin and prepare some fundamental information for future measurement. Therefore, in the first part of the thesis is our main task is to create a~sufficient theoretical background for printed circuit boards, immersion tin and solderability. Then we are able to use previously created theoretical background to measure selected samples. Thereafter the measured data can be used for more strict evaluation, from which the results of measurement can be obtained.
Evaluation of incidence and importance of specific organic and functional changes of central nervous system in patients with neurofibromatosis type 1
Glombová, Marie ; Komárek, Vladimír (advisor) ; Nevšímalová, Soňa (referee) ; Starý, Jan (referee)
The aim of the study was to evaluate the importance of brain MRI's findings, and modify the criteria for brain MR imaging in NF1 patients according to this data, to improve the quality of life with early detection of important NF1 complications. Description of the whole cohort, with emphasise to possible cause of high range of sporadic NF1 cases. Evaluation the possibility diagnosis or follow up of brain gliomas by plasmatic values of neuron specific enolase (NSE) and S100B protein. Subjects and methods: I analysed data from 285 NF1 children followed up on our department from 1990 to 2010 by the same examination battery. I evaluated the incidence of brain MRI findings, clinical development, age at gliomas manifestation and necessity of treatment. I also described the whole cohort and made statistic analysis of plasmatic values of NSE and S100B protein in NF1 patients, with and without brain gliomas. Results: OPGs were found in 77/285 (27 %) children and GOOPs in 29/285 (10.2 %) of NF1 children, of who 19 had OPG and GOOP together, so the total number of brain glioma was 87/285 (30.5 %). Totally, 43/87 (49.4 %), respectively 43/285 (15.1 %) children with brain glioma were treated, and 4/285 (1.4 %) of this children died. Obstructive hydrocephalus was found in 22/285 (7.7 %) patients and was caused...

National Repository of Grey Literature : 220 records found   1 - 10nextend  jump to record:
See also: similar author names
2 STARÝ, Jakub
16 STARÝ, Jan
1 Starý, J.
16 Starý, Jan
3 Starý, Jiří
14 Starý, Josef
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