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Control and monitoring of parameters in microfluidic systems
Meloun, Jan ; Sekora, Jiří (referee) ; Čmiel, Vratislav (advisor)
This thesis discusses the construction of Microfluidic systems for a microscope. The theoretical part of this thesis deals with cell and its survival in the environment. Furthermore, light, light’s behavior and optical spectral analysis in some methods is discussed. Also, the use of the development platform Arduino with wireless data transfer for data visualization is mentioned. Methods for measuring pH are mentioned as well. The practical part is dedicated to the construction of the Microfluidic system with the use of Arduino, smart mobile devices and a developed mobile application including controlling liquid flow with the measured data visualization.
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Characterization and evaluation of stability of oils from sea buckthorn berries
Michalíková, Adéla ; Hudeček, Jiří (advisor) ; Kubíčková, Božena (referee)
This diploma thesis deals with characterization of sea buckthorn oil. The sea buckthorn oil is frequently used as a food supplement and in dermatology. The first part summarizes the literature on sea buckthorn oil and its biological effects. In the experimental part, the thesis deals with the comparison of three commercially available preparates of sea buckthorn oils. We employed the basic characteristics of these oils, including the determination of peroxide value, iodine value, saponification value and acid value using titration methods. Spectroscopic measurements were used to further characterize the oils. The comparised sea buckthorn oil samples differed strongly in the peroxide value and in the stability during storage. In this respect, the oil from Relikt - Art Engel company had significantly lower value (2,95 mekv/kg) compared to other two oil samples studied from Elith Phito and Virde companies with peroxide values 12,68 and 8,97 mekv/kg. This value was also much less prone to increase during storage. A similar difference was also found in spectral and colorimetric characteristics of the oil samples, where this oil displayed much less optical density then the other two samples. This might be a result of different technology used for production of oils, or it may reflect some adulteration,...
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Colorimeter
Škoda, Pavel ; Janáková, Ilona (referee) ; Honec, Peter (advisor)
This thesis deals with the analysis of the color parameters for their subsequent use in the design of the device, which will be used to measure their stability in continuous production. The theoretical part defines the basic concepts and knowledge needed to understand the problems. In addition, there are described individual components and sensors suitable for color measurement. The practical part deals mainly with the descrip- tion of the construction of the colorimeter, its individual parts and the creation of the control program. At the end, there are results of the testing of the product and their overall assessment
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Quantitive optical analysis using cell phone
Petlák, Daniel ; Svoboda, Ondřej (referee) ; Čmiel, Vratislav (advisor)
This bachelor‘s thesis discusses methods for the quantitative colorimetric analysis using a cell phone and a design of my own analyzer. Theoretical part deals with basic characteristics of light and division of optical spectral analysis, which is described by several optical methods. The bachelor’s thesis also contains the division of colorimetric analyzers according to their types. The most important part is focused on a colorimetric analysis using the cell phone and familiar with the possibilities of analysis of liquids and solid samples. The practical part deals with the design of a separate analyzer using the cell phone, developed application including the possibility of calibration values of prepared samples and subsequent evaluation of ion concentration in unknown sample. For the accuracy of the results is made dark light-tight cover printed by 3D printer.
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Mezikulturní rozdíly barevných preferencí
Viková, Martina ; Vik, Michal ; Kania, Eva
Color plays an important role in life, which affects our perception, shifting meanings of symbols, emphasizes or suppresses communication of pictograms, logos, brands, acts of emotional perception, affects mood. Color is very important for designers; graphics, artists, and it can significantly affect the acceptance of the artwork, merchantability or relationship to the artwork. It is important to know how the color affects the humans. For pictograms there is a tendency to place priority on shape to color. But sometimes the similar pictograms have different meanings when the color is added. This is the same for design, for example great chandelier can cause a calming effect or support activity only with a change of color. Correct use of color helps with orientation in symbols, e.g. pictogram for hot and cold water or designation of toilets is understandable with color. Conversely, wrong use color can confuse. The purpose of this project is, a) relationship of colors and words; which color people associate with certain words; b) influence of culture on word and color association. In this article were tested the habits of Czech, Japanese and Russian nation. Among the concepts evaluated were found to group words, which are characterized by strong emotional attachment to the expressions given by the change in both cultures, similarities respectively.
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Barevný vzhled dekorativních povrchů
Vik, Michal ; Čejka, Václav ; Viková, Martina ; Maltseva, Anna
The article explains the basic concepts of colorimetry and deals with issues of assessment reflectance quality of special plaster coatings in accordance with current methods of measuring spectral reflectance of the International Commission on Illumination (CIE). The results demonstrate that in the case of coatings with high gloss values leads to a linear increase of chroma depending on the lightness values in the case of measuring devices fitted diffusion geometry. Conversely, if the angle-measuring instrument fitted geometry values of specific purity correlated with values of specific brightness. Analysis BRDF, respectively BSRDF function showed that the previously used dichromatic spectral reflectance model must be extended by an additional parameter explaining the correlation between chroma and lightness at the di:8 measurement geometry.
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Spektrální distribuce použitých světelných zdrojů a hodnota bělosti FWA vzorků
Vik, Michal ; Viková, Martina ; Prince Periyasamy, Aravin
The Whiteness of textiles, plastics, paper and paints is important aspects, which are considered in daily life. Customers usually prefer white products, especially in summer because of comfort reasons. In addition, white, being an achromatic color has a physiological effect on human sensation. Generally, High whiteness is not possible to get through only bleaching process. Therefore, the application of FWA’s (Fluorescence Whitening Agents) is a common practice in industry where the need to achieve “high” whiteness. In the case of white materials, the nature of these chemicals is to absorb light in the invisible, or near ultra-violet, region of the spectrum and then re-emit this light as fluorescence in the visible region of the spectrum. This re-emitted light generally occurs between 420-500nm. The effect is a greater degree of reflectance in the blue region of the spectrum, therefore a “bluer” white. In effect, this process produced much whiter whites! Consequently to other color attributes of an object depends on many factors, such as lighting (illumination), size of sample, and background and surrounding colors. Much more importantly, color is a subjective phenomenon and depends on the observer. In this article were discussed the influence of SPD (Spectral Power Distribution) tested light sources on whiteness. Solid-state lighting (white LEDs, etc.) is necessary to improve by a full-visible-spectrum technology because standard white LEDs are unable to activate FWA’s sufficiently. Ra does not capture this issue or other conventional color rendition metrics, although it corresponds to a very large color distortion for shades of white. Full-visible-spectrum LEDs emit no harmful ultra-violet light, but enough violet light to properly excite FWA’s and render whites like natural sources.
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Rozlišovací schopnost barev na pomezí fotopického/mezopického vidění
Vik, Michal ; Viková, Martina ; Pechová, Marcela
The human eye is most sensitive to the wavelength region 555 nm, with decreasing light intensity is shifted the sensitivity of the human eye to shorter wavelengths. Subjective evaluation of observers (Farnsworth-Munsell 100 Hue test and a set of color chips) were performed under seven luminous levels on mesopic and photopic luminance level, which have been achieved application of proof car foils with different luminous transmission on polymethylmethacrylate plates. A select group of observers was divided according to FM 100 Hue Test to the categories superior (The total overall error score to 19) and average (The total overall error score to 100) by the total overall error score. For the evaluation of the observers was chosen set of color samples defined by National Coil Coaters Association (A prismatic display of Measured color difference). They are colorful papers square chips with the measured color difference with 1 or 5 units (progressively according the axis L + a + b +, L-, a-, b-) from the center chip (16 center chip, total of 96 samples). Of the evaluated data it was found that the evaluation of color differences on chips with small color difference (DE = 1) is the distinction these chips possible even at 1 lux. From this luminous lighting increased differentiation between trials observers. For chips with a larger color difference (DE = 5) were the differences in evaluation observers at all high luminance levels.
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Gamut mapping algorithms in color management
Svoboda, Jan ; Říha, Kamil (referee) ; Rajmic, Pavel (advisor)
The thesis deals with colors - their representation in digital devices and how to provide the best color preservation accross different devices. In the first part of the work, the knowledge of colors and human vision is briefly summarized. Then color models and color spaces are elaborated, mainly those device independent. Spectrum of colors viewable or printable on a device - the gamut - is different for every device and there's a need of precise reproduction or record of color. That's why the system of color management is described further and especially the gamut mapping approaches and algorithms are mentioned. In the second part of the work, the implementation of how two algorithms of color gamut mapping (HPMINDE, SCLIP) can be implemented in MATLAB is described. In the third and last part of the work, the results of implemented algorithms are presented and discussed. These results are compared to results of commonly used color gamut mapping technique (Adobe Photoshop).
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