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Hardware Accelerating of Encryption Algorithm
Hradil, David ; Martínek, Tomáš (referee) ; Kořenek, Jan (advisor)
The goal of this thesis is to design a hardware realization of circuit which will implement the AES algorithm. A motivation was to make an acceleration against the classic software encryption. The acceleration is achieved by special designed parts of the circuit, which correspond to particular operations of the AES algorithm. First, there was necessary to design the circuit. In the next step there was a need to describe the designed circuit by the VHDL language. Then the circuit was simulated and synthesized. Due to comparing the circuit with software processing a software implementation was created. Both implementations were created for the FITKit platform. The hardware implementation is made by the FPGA technology and the software implementation is realized in a microcontroller. The result of the thesis is almost one thousandfold acceleration against the classic software encryption.
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Stainless steel for steam sterilizer components
Hradil, David ; Němec, Karel (referee) ; Pacal, Bohumil (advisor)
The thesis titled "Stainless steel for steam sterilizer components" is focused on the selection of the optimum stainless steel for the device, in our case, pure steam generator. In this thesis are introduced the main mechanisms and types of corrosion. There are divided and characterized by various types of stainless steels. The choice of material is carried out with regard to the working environment and the technological possibilities of the individual types of stainless steels.
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Mechanical and microstructural characteristics of materials produced by SLM method
Hradil, David ; Jan, Vít (referee) ; Pantělejev, Libor (advisor)
The master's diploma thesis deals with the mechanical and structural characteristics of aluminium-base alloy 2000 series, produced by selective laser melting (SLM). The experimental part of the thesis deal with selection of SLM processing parameters, influence of scanning strategy and evaluation of mechanical and structural characteristics of fabricated materials. Mechanical characteristics were evaluated based on results of tensile tests and microhardness measurement. Structural characteristics of materials produced by SLM were evaluated using metallographic analysis.
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Methodology for determining forgeries and copies of miniature paintings
Sondej, A. ; Hradilová, J. ; Hradil, David
The methodology describes the signs by which it is possible to distinguish between an original miniature portrait painting and other types of imitations, whether they were produced individually or in serial reproduction. For this classification, the methodology uses both routinely available tools (e.g. a magnifying glass or a stereomicroscope) as well as specialized imaging and analytical instruments, without the help of which accurate determination cannot be done. In all cases, these are non-invasive procedures that do not require any material removal from the painting. The analytical procedures used to determine the provenance of a work are in some cases completely new.
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Methodology for determining forgeries and copies of miniature paintings
Sondej,Antonín ; Hradilová,Janka ; Hradil,David
The methodology describes the signs by which it is possible to distinguish between an original miniature portrait painting and other types of imitations, whether they were produced individually or in serial reproduction. For this classification, the methodology uses both routinely available tools (e.g. a magnifying glass or a stereomicroscope) as well as specialized imaging and analytical instruments, without the help of which accurate determination cannot be done. In all cases, these are non-invasive procedures that do not require any material removal from the painting. The analytical procedures used to determine the provenance of a work are in some cases completely new.
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Noninvasive spot analysis of miniatures with portable and laboratory instruments: a methodology for specific use in miniature painting research
Kočí, Eva ; Bezdička, Petr ; Hradil, David ; Garrappa, Silvia ; Hradilová, J. ; Pech, M.
The methodology brings a comprehensive procedure of non-invasive materials analysis of painted miniature artworks, while it is divided into two subsequent parts. In the first part, it describes the use of portable devices for spectroscopic analysis of miniatures, and in the second, it deals with the application of a new methodological procedure for phase/structural materials analysis based on X-ray powder diffraction. The methodology thus includes the following procedures: (i) determination of the elemental composition of the colour layer by the x-ray fluorescence analysis, (ii) identification of binders and other organic compounds using infrared spectroscopy (FT-IR), and finally (iii) phase/mineralogical and structural analysis to describe in more detail the pigments used and processes of their degradation. As part of this last step, the limits of Raman spectroscopy (RS) and the advantages of powder X-ray diffraction and micro-diffraction (XRPD and micro-XRPD) are described, which include greater gentleness to the analysed objects. A very complete and above all non-invasive methodological procedure for the analysis of miniatures is thus offered, which uses the complementarity of individual methods and which can be partly applied already in situ (directly in collection institutions) and partly at specialized workplaces.
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Application of Environmental Scanning Electron Microscopy (ESEM) in the field of miniatures´ analysis: methodology for specific use in miniature painting research
Hradil, David ; Hradilová, J. ; Neděla, Vilém ; Tihlaříková, Eva
The methodology deals with a completely new, unused procedure of non-invasive analysis of painted portrait miniatures, namely an environmental scanning electron microscope with energy-dispersive X-rays. spectrometer(EREM-EDS). EREM, unlike the conventional scanning electron microscope (REM), allows the analysis of ivory painting, which is not possible in a vacuum or low gas pressure environment, where there is a risk of deformation and damagedue to drying of this biological material. The methodology is divided into two parts - the first describes the study of morphological details at high magnification (eg. the possibility of distinguishing different types of biological substrates), the second is the implementation of elemental analysis in high spatial resolution.
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Metodika pro obrazovou a morfologickou analýzu miniaturních portrétů
Pech, Michal ; Hradilová, Janka ; Hradil, David
The methodology is intended primarily for laboratories and restorers; it describes basic non-invasive methods of image and morphological analysis suitable for the study of miniature painting. Commonly used methods of restoration research designed for the study of easel and panel paintings can also be applied to the study of miniatures; however, their small size, materials, and techniques impose a number of limitations. Traditional invasive methods associated with sampling cannot be used when examining miniatures. The methodology describes how to adapt commonly used methods, such as visible and UV-light imaging, infrared reflectometry and digital radiography, to the study of miniatures. X-ray fluorescence scanning (MA-XRF spectroscopy) is proving to be a particularly important tool for pigment identification and the study of miniature painting techniques, with its ability to produce high-resolution elemental maps. In the future, it can be expected that this still not widely used method, which combines the advantages of image and analytical methods of exploration, will be rapidly developing.
Fulltext:  PDF
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Bodová neinvazivní analýza miniatur přenosnými a laboratorními nástroji: metodika pro specifické použití ve výzkumu miniaturního malířství
Kočí, Eva ; Bezdička, Petr ; Hradil, David ; Garrappa, Silvia ; Hradilová, Janka ; Pech, Michal
The methodology brings a comprehensive procedure of non-invasive materials analysis of painted miniature artworks, while it is divided into two subsequent parts. In the first part, it describes the use of portable devices for spectroscopic analysis of miniatures, and in the second, it deals with the application of a new methodological procedure for phase/structural materials analysis based on X-ray powder diffraction. The methodology thus includes the following procedures: (i) determination of the elemental composition of the colour layer by the x-ray fluorescence analysis, (ii) identification of binders and other organic compounds using infrared spectroscopy (FT-IR), and finally (iii) phase/mineralogical and structural analysis to describe in more detail the pigments used and processes of their degradation. As part of this last step, the limits of Raman spectroscopy (RS) and the advantages of powder X-ray diffraction and micro-diffraction (XRPD and micro-XRPD) are described, which include greater gentleness to the analysed objects. A very complete and above all non-invasive methodological procedure for the analysis of miniatures is thus offered, which uses the complementarity of individual methods and which can be partly applied already in situ (directly in collection institutions) and partly at specialized workplaces.
Fulltext: PDF
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Mineralogical analysis of historical paintings
Čermáková, Zdeňka ; Hradil, David (advisor) ; Kanický, Viktor (referee) ; Artioli, Gilberto (referee)
Historical painted works of art have a very complex inner structure. The period painting technique led to the execution of a ground layer followed by several layers of underpainting and a top paint layer, over which a layer of glaze has been applied to increase the resistance to external wear. Each of these colour layers is composed of a dye or a pigment (or their mixture) bound by organic binder. Throughout the history, pigments were commonly prepared from minerals, either extracted from natural deposits or created artificially. In these heterogeneous layers containing both inorganic and organic components, undesirable degradation changes either driven by processes taking place directly in the colour layer or influenced by external agents may occur. Mineralogical approach, which focuses primarily on the structure of studied pigments, helps in the clarification of the occurring processes, in the determination of conditions leading to degradation as well as in the identification of original/degradation phases. Furthermore, it can be profitably applied in the micro- analysis of mineral pigments present in tiny micro-samples obtained from works of art, contributes to the artwork's provenance/authorship studies and the determination of regional provenance of the employed mineral pigments. This Ph.D....
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