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Mobile germicidal source
Procházka, Michal ; Murina, Milan (referee) ; Steinbauer, Miloslav (advisor)
Germicidal light is a type of UV light which is able to kill bacteries and microorganisms. These germicidal lamps usually operate on the same principle like common fluorescent lamps but they emit the different spectra. For higher efficiency and longer lamp life it is desirable to use electronic ballast as a source for germicidal lamp which in version of integrated circuit offers further advantages. First part of the thesis describes the theory of UV desinfection and electronic ballasts. The second part is about the construction of the mobile germicidal source. In the last part of the thesis there is the germicidal mobile source tested against a few various mildews.
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Organic dye decomposition by AOP´s methods
Olexová, Barbora ; Dzik, Petr (referee) ; Kozáková, Zdenka (advisor)
This diploma thesis is focused on the study of the influence of advanced oxidation processes on degradation of organic dyes. The field of AOP – very effective physically-chemical methods of wastewater treatment – includes application of strong oxidation agents, UV and ionizing radiation and electrical discharges. For this thesis, two of these methods were chosen – the application of oxidation agent (ozone) and UV radiation. Along with electrolysis, which is mentioned rather marginally in this thesis (it is the subject of the previous thesis), these phenomena are products of electrical discharge in water, where they participate in the processes of degradation in a different way. For all measurement series, two direct azo dyes were chosen as model substances – C.I. Direct Blue 106 and C.I. Direct Red 79. The ozonizer, in which either oxygen or synthetic or technical air were loaded as carrier gases, was used for degradation of dyes by ozone. The generated ozone was loaded into the bubbling vessel with dye solution of different initial concentration (10–130 mg.dm-3), which was followed by other bubbling vessel with KI solution for the next analytical determination of the amount of generated ozone. The other parameters changed were the gas flow (1–2 dm3.min-1), ozonizer output (minimal and maximal), type of dye, pH value of the solution (neutral or acid) and additional electrolyte (NaCl, Na2SO4 or any). The reactor for the study of the influence of UV radiation on degradation of dyes was an UV sterilizer into which the equivalent volume of dye solution was added. The possibilities of experimental settings were limited and only the type of dye, an additional electrolyte and pH value of the dye solution were adjusted (as in the case of ozone). Several series of samples were measured with various input conditions which more or less influenced the degradation of investigated dyes in this experiment. It was found that for both used methods the Direct Blue 106 dye was more degradable (with significantly better results for ozone than for UV radiation). The degradation of Direct Red 79 dye proceeded only by ozone treatment, in the case of the application of UV radiation no degradation occurred. By investigation of the influence of initial concentration of dye on its degradation, it was confirmed that with the initial concentration enhancement the final concentration rises as well, whereas in low concentrations (10–50 mg.dm-3) the initial concentration has no effect. The addition of an electrolyte had an accelerating effect on dye degradation in both methods (NaCl and also Na2SO4 showed similar results though the degradation proceeded in different ways). The addition of HCl accelerated the degradation only in the case of UV radiation; during the application of ozone the pH level of the system did not have any influence on the degradation. Oxygen and synthetic air had the strongest effect on ozone degradation (comparable results); in the case of technical air the final dye concentration was higher up to 30 %. The gas flow of 1.5 dm3.min-1 was stated as optimal with the ozonizer output 30 W (maximal). At minimal power the ozonizer produced very low amount of ozone.
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Optical properties of protective emulsions
Valasová, Denisa ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
This bachelor´s thesis is aimed to the study of optical properties of protective commercially available emulsions. Chosen emulsions should be responsible for sun protection. They also may be used in cosmetic industry. In the beginning of the thesis, there are defined theoretical features of emulsions and their interaction with UV radiation. Methods which are used to describe optical properties could be found in this section too. The optical properties were measured in thin layer films, in order to simulate emulsions applied on the human skin. UV-VIS spectrophotometry was mainly used to study the optical properties. The obtained results could serve, purely hypothetically, like sun protective tests of chosen emulsions.
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Testing of polymeric materials under climatic conditions of Antarctica
Mičkal, Petr ; Sluková, Michaela (referee) ; Krmíček, Lukáš (advisor)
The bachelor's thesis generally deals with polymer materials and evaluates the possibility of testing their resistance to extreme climates of Antarctica. Described herein are various polymer materials, their characteristics, structure, properties and more thorough and detailed descriptions of selected polymers. The next section describes the basic types of degradation these polymers are exposed to, when facing the extreme conditions of the Antarctic climate. The practical part contains evaluations of tests made on the degraded polymer materials that were collected in Antarctica during the southern Antarctic season of 2013-2014 by Ing. Bc. Pavel Kapler, Ph.D, who is a superintendent at the Czech scientific station JG Mendel.
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Optimizing requirements for wood coatings
Bednářová, Ilona ; Petránek, Vít (referee) ; Vaněrek, Jan (advisor)
The work deals with wood coating systems. It is focused on the theoretical division of paints due to different aspects, moreover on testing of wood coating systems. In the practical part of the work, the experimental work regarding the influence of weather conditions onto durability of different wood coatings system was preceded. They were compared two different coatings within the basic tests in different environments.
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The application of chlorine for public swimming pool water disinfection
Wagnerová, Andrea ; Svoboda, František (referee) ; Biela, Renata (advisor)
The bachelor thesis focuses on issues surrounding disinfectants of swimming pool water. The dissertation examines various chlorine based disinfectants as well as chlorine free disinfectants. Part of the thesis compares advantages and disadvantages of different possibilities of securing hygienic swimming pool water. Several complexes of public swimming pools in Brno and its neighbourhood were visited in order to examine the methods of disinfection, which are currently used at those swimming pools. Disinfectants based on chlorine are currently used the most for swimming pool water.
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Development and optimization of stable recipe of tanning lotion.
Němečková, Lenka ; Pávek, Stanislav (referee) ; Pekař, Miloslav (advisor)
This bachelor´s thesis is focused on problems of development and optimalization of stable formula of sunscreen with a sun protective factor SPF 15, which is produced in Altermed Olomouc company. In theoretical part are defined terms as cosmetics, laws, which deal with cosmetics and sunscreens especially. Somatic types of the skin, their reaction to UV rays and their protection against them are there described as well. In experimental part there summarized all requirements, which are necessary to realize for introduction of preparation into the market place and during long term use it must continue to pass all laws, health, marketing and functional claims. I produced a sample of stable sunscreen with protective factor SPF 15 in practical part. This sample was tested in accredited laboratory for all aspects which are necessary for legislation. The results of these testing are noticed in laboratory protocol.
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Options hygiene of drinking water
Šopíková, Lucie ; Hlaváč,, Jaroslav (referee) ; Biela, Renata (advisor)
The first part my Graduate work contains an overview of all possible types of disinfection of drinking water used in the present. The second part shows examples of use of each mentioned type of drinking water disinfection methods, which can be found in practice, that is on water treatment plants. The conclusion is a comparison of advantages and disadvantages of various methods of disinfection.
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The Effects of the UV Radiation on the Human Body
MACHOVÁ, Petra
Work maps tailored health students from the harmful effects of UV radiation and traces their knowledge about the effects of UV radiation on the body. The cohort consisted of students and combined form of Health and Social Studies University of South Bohemia in Ceske Budejovice. The aim of this work is to identify students' knowledge of ZSF JU. The effects of UV radiation on the human body and mapping the extent of protection of health of students of the ZSF JU from the harmful effects of UV radiation. The theoretical part describes the general characteristics of UV radiation and its effects on the human body. Work is more geared to actual problems of skin tumors, mainly the issues already mentioned malignant melanoma, which is currently the worldwide especially among the white population serious health problem. In this work he received a lot of attention because among all tumors occupies an important place mainly due to the increase in the number of cases in recent years, due to the very difficult to estimate prognosis and often very rapid pace. The theoretical part deals with the issues of prevention and alone and prevention programs that are reticent part of health care , and that can detect the disease at a stage when it is still treatable. Has a special position then the international program of the World Health Organization WHO Intersun that assesses and quantifies health risks and develop appropriate responses by issuing various directives, recommendations and dissemination of information, while providing practical advice and information to government health and environmental issues in UV radiation. Practical work logic device monitoring students' knowledge about the positive and negative effects of UV radiation on the body, while also monitoring their attitudes toward tanning , protection from sunlight and behavior in case of suspicious skin changes.
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