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The pressure measuring using LTCC technology
Straka, Michal ; Řezníček, Michal (referee) ; Kosina, Petr (advisor)
This thesis deals with the problems of the pressure sensor made on a low temperature co-fired ceramics. The pressure sensor converts the measured physical quantity to the electrical signal. The strain-gauge, capacitive and optical sensors are used for scanning of the pressure. It is possible to construct the multilayer sensors with holes and cutouts, through the use of the 3D structure on LTCC sensors. The passive parts can be applied on this layer through the thin-layer or thick-layer technology, which creates conductible paths and contacts for parts and outlets. In the practical part of the work, a few construction types of pressure sensors are designed, implemented and measured. Emphasis is given to strain-gauge strip sensor and possible problems during its manufacture, lamination and deformation of burn-out.
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Laser diode soldering
Straka, Michal ; Holík, Milan (referee) ; Stejskal, Petr (advisor)
This work deals with the laser diode soldering. The theoretical part summarizes general and acquired findings about soldering technology and materials that occur in this process. It also describes factors that affect the reliability of solder joints. It is closely focused to the shaping of the solder joint and structure of intermetallic layer. The practical part of this work is focused on the design of equipment for laser diode soldering and subsequent shaping of the samples. The quality of soldered joint is compared against the quality of joint created using re-flow technology - remelting in in-line smelter. The structure and thickness of the intermetallic layer, the number and shape of the voids in the solder joints are compared.
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Software support of the enterprise processes
Straka, Michal ; Jelínek, Petr (referee) ; Videcká, Zdeňka (advisor)
Master’s thesis solves the problem of design and implementation of the management information system directed on monitoring productivity of labour in the company. It’s main goal is to – based on the analysis of the actual state - create new, automated, identification and registration software system, which will serve to production leaders as a support for operative management. Project solves the problem of automation of data processing, automation of creation of continuous analyses and monitoring the productivity of labour in the key process of the company – the process of assembling of packages – with the ability to determine instant working performance and productivity of an individual worker.
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Use of Photovoltaic Systems in Off-grid Applications
Straka, Michal ; Macháček, Jan (referee) ; Baxant, Petr (advisor)
This masters thesis deals with the use of off-grid photovoltaic systems. First we explain the problems associated with the power and energy potential of photovoltaic system components, design of photovoltaic systems for autonomous operation and the financial evaluation. The result of the masters thesis is to create an application used to design the island system in the whole output range (the smallest power systems to house systems application). The conclusion of the masters thesis is devoted to designing three type of projects from our application – a garden cottage, a family cottage and the house.
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Porovnání technickoekonomických parametrů při využití nakladačů v komunitní kompostárně
Straka, Michal
The thesis focuses on a technic-economical comparison of a tractor front loader, an articulation joint front loader and a telescopic handler for their usage in community composting plants. The theory describes the classification of agriculture class front loaders, describes a composting process of a green waste in Kuchařovice community composting plant and defines the chosen technic-economical parameters of loaders being compared. In the practical part, the chosen technic-economical parameters were put under experimental measurement, mainly focused on productive efficiency and direct financial expenses. Schemes of further integration into Kuchařovice composting plant running and other municipality services, based on suitability ratings, are specified. As a conclusion, the practical part outcomes are published and a suggestion for a new technical solution/new loader acquisition is presented.
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Endohedral fullerenes: From exotic chemical bonding to molecular electronics
Jaroš, Adam ; Straka, Michal (advisor) ; Uhlík, Filip (referee) ; Patzschke, Michael (referee)
This work focuses on the theoretical study of the physical and chemical properties of endohedral fullerenes, which can be used either to study exotic chemical bond- ing or as components in molecular electronics. Part of this work is focused on the study of interactions of simple molecules enclosed in a fullerene cage, such as H2O, HF, NH3, or their dimers, and the observation of the so-called charge-shift bonding. We have also investigated the bonding interactions between actinide atoms in fullerenes and described general trends associated with this bonding. In the course of studying actinide endohedral systems, we have proposed and cali- brated a methodological approach to investigate the actinide-actinide bonding, applicable in future research. The acquired knowledge about the interactions in endohedral fullerenes al- lowed us to design molecular components usable in so-called non-von Neumann architectures. First, we published a proof-of-concept study on diatomic MX molecules (M = hydrogen or metal, X = halogen or chalcogen) enclosed in a C70 cage. The molecule enclosed inside the cage can be rotated by an external electric field; thus the whole system acts as a switch. We found that the conductivity of the system depends on the rotational state of the molecule enclosed within the system, and the...
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Theoretical investigation of novel two-dimensional materials with application potential
Lyu, Pengbo ; Nachtigall, Petr (advisor) ; Maurin, Guillaume (referee) ; Straka, Michal (referee)
Electron confinement due to the two-dimensional (2D) nature of layered materials accounts for their fascinating electronic properties and for their applications in new-generation electronic devices. Moreover, the large specific surface area of 2D materials also enables their use in surface-related applications, such as catalysis and adsorption. In addition, these 2D materials are promising photocatalysts thanks to the shorter migration distance of photogenerated electrons and of electron holes. The research reported in this thesis aimed to provide atomistic insight into 2D layered materials, particularly into their structures, electronic properties and potential applications in the field of catalysis, photocatalysis and alkali metal ion batteries. Our findings are not only theoretically relevant but also open new research avenues for our experimental collaborators to improve specific properties and activities of their materials. The main results from this thesis, for five different classes of 2D materials, are summarized below. 2D covalent organic frameworks (COFs). CTF-type COFs with similar topology but different nitrogen-to-carbon ratios were investigated for their potential in photocatalytic water splitting. More specifically, torsion and bending effects on structure stability were investigated in...
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Socioeconomic passportization of immovable cultural heritage
Kouba, Vojtěch ; Lindner, Milan ; Vořechovský, Jan ; Dostál, Petr ; Pátek, Zdeněk ; Dianová, Markéta ; Titelbachová, Šárka ; Tyslová, Irena ; Straka, Michal ; Zelený, Martin ; Kubaš, Mario ; Hanzlík, Jan ; Vančurová, Alena ; Vond, Zdeněk
Předkládaná metodika je výsledkem aplikovaného výzkumu a je zaměřena na ekonomiku památek, resp. nemovitých objektů prohlášených kulturními památkami České republiky. Jejím cílem je vytvoření pasportů ekonomických hodnot pro jednotlivé památkové objekty, v případě využití metodiky orgány veřejné správy i pro soubory památek určitého druhu či soubory památek na vymezeném území.
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