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Logistics and supply of PCB for repair of notebooks
Grob, Filip ; Starý, Jiří (referee) ; Špinka, Jiří (advisor)
This diploma thesis deals with issues of inventory management and logistics controlling. These segments are one of most important instruments used in logistics. Theory of these logistic instrumens are used as a base for practical part of this diploma thesis, where is described and suggested methodology for inventory management of printed circuit board in repair center. This buffer inventory serves for securing performance of customer’s supplies in case of failure on repair line. Thereinafter is realized program in MS Excel interface for supplying leadership with main insistence to prevent order delay.
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Production of Multilayer PCB
Janda, Ondřej ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
This master thesis introduces the problematics of multilayer printed circuit boards. Theoretical part is focused on materials used for production of multilayer PCB and their parameters. At the same time, it focuses on the pressing process of multi-layered PCB, the types of presses used and their advantages and disadvantages. Practical part describes the methodology and testing of the PCB to identify the reliability of chosen electrical parameters. Testing is aimed to simulate thermal stress during machine soldering and during thermal stress in the target environment.
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PCBs Repairs with BGA and FC Packages
Buřival, Tomáš ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Graduation thesis is specialized on dilemma of the integrated circuits with ball grid array. Chapter two describes several types of packages and confrontation of their characteristics. Chapter three considers possibilities of corrections these boards bedded with packages, mounting and demounting of these packages, method of camera control and also inspection of the soldering process. Chapter four attend to practical measuring of thermal profiles and their optimalization.
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Quality of PCB Surface Finishes and Test Coupon Optimization
Minář, Jan ; Přikryl, Tomáš (referee) ; Starý, Jiří (advisor)
This master’s thesis deals with measuring and evaluation of wetting for samples of different surface finishes, using a test coupon developed in cooperation with firm Gatema. It deals with surface finishes ENIG and immersion tin. For these samples deals with quality monitoring and periodic testing of these surface finishes. The solder using for tests is SAC305. Test methods are used for simulation of reflow soldering and wave soldering.
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QFN Packages Soldering and Technology Procedures
Jakub, Miroslav ; Brno, Petr Martinec, HONEYWELL (referee) ; Starý, Jiří (advisor)
This master´s thesis deals with QFN packages soldering and technology procedures optimization. The aim of theoretical part is description of QFN packages, their assembly and reflow soldering on PCB in HONEYWELL. The aim of the practical part is to propose a method of measuring temperature and optimizing the thermal profiles of selected PCB with QFN packages by using convection (HONEYWELL) and infrared (BUT) reflow ovens. Comparison and evaluation of thermal profiles for 3 production PCBś with QFN packages using solder paste AIM NC257-2 were realised. The main part of master´s thesis are appearance evaluation of solder joints, preparing microsection and measuring intermetallic layers thickness by using the optical and the scanning electron microscopes, analysation and study of QFN defects created during soldering proces. These tests were performed with 2 production PCB´s. Optimization of SPI and soldering technology procedures where were analyzed QFN packages were processed on one type of PCB. Interesting part of this diplomma thesis is creating of the 3D heat transfer model of QFN package during the reflow soldering in SolidWorks.
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Historical block of flats development with its impact on market prices of flats on the present in Liberec
Starý, Jan ; Khaddour, Ahmed (referee) ; Cupal, Martin (advisor)
This thesis on historical development of the construction of residential buildings and its effect on market prices of dwellings currently in Liberec accompanies the issue of correlation between architectural styles and price currently. It is divided into two parts, theoretical and practical. The theoretical part is focused on explaining concepts such as housing, housing stock, housing market and its failure, which follows the historical description of the construction of residential buildings. In other chapters of this part is talking about urban planning and housing policy. The practical part looks at this issue from the perspective of a particular town, which is Liberec. For him the basic information about the local conditions, history of architecture and subsequently through the commodities market tested real estate prices mentioned correlation and era of construction. The main source of research is in the thesis comparing average prices per m2 for each building type. During and at the end, the results are commented and compared.
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Solder Joint Quality based on Heating Factor
Kučírek, Martin ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Master’s thesis in the theoretical part analyses the heating factor (Q), which has significant share on quality of a solder joint. The practical part describes the design and production of test PCB and setting temperature profiles, SMD resistors soldering by using BiSn solder paste. Shear tests of SMD solder joints were realised and evaluated including isothermal ageing samples. At the end of master’s thesis solder joints visual aspects and defects were evaluated, measurement thickness of intermetallic compound by not only optical microscope but also SEM, discussion about results and Q was evaluated.
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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.
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Organic semoconductors materials
Černošek, Michal ; Starý, Jiří (referee) ; Špinka, Jiří (advisor)
This bachelor thesis deals with organic materials and parts made of this materials. Described are also principels of their functions, structure of whore part and issues linked with production. Next are refered advanteges and disadvantages of those parts. Described are also events which occures during using organic parts. Attention is given to light emitting diods. In experimental part is measured electrical attriburtes of PLED structures, exposed to different sources of illumination. Influence of illumination to transfer of electrical charge is examined too
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