|
|
Contaminant transport in karst environment and tracer tests in karst system near Turnov
Malechová, Kateřina ; Slavík, Martin (advisor) ; Weiss, Tomáš (referee)
Karst areas are an important source of drinking water but they are at significant risk of contamination. The theoretical part of the thesis focuses on different types of contaminants, their sources and their ways of transport in karst areas. Due to the high velocity of water flow in karst areas, most contaminants are transported rapidly and spread over long distances. Therefore, it is necessary to actively address the issue of contamination in karst environments, focusing mainly on contamination prevention and water flow studies. In the practical part of the thesis, a quantitative tracer test was carried out in the karst system near Turnov using NaCl as a tracer. The measurements confirmed a high water flow velocity of several kilometers per day and the dominance of advection as the main transport process. These results are consistent with previous research. The connection between the sinking stream Šálení smyslů and the Slapy and Bezednice springs was also reconfirmed, with a total recovery of around 50%. This implies that water from the Šálení smyslů most likely flows to other, yet unknown, locations. No communication with the Bartošova pec cave or with the springs used as a source for the local brewery has been demonstrated, so the question remains where all the water from the sinking stream...
|
|
|
Research on the load-carrying capacity of lubricating film in rolling bearings
Šmíd, David ; Čermák, Jan (referee) ; Omasta, Milan (advisor)
This diploma thesis deals with the problem of sudden contamination of the elastohydrodynamic contact by solid particles and their influence on parameters affecting the lubricating film, such as surface texture and real film thickness, especially for line contact. The contact is operated under conditions corresponding to the operation of the main wind turbine bearings, with measurable parameters supported by optical observations. The main effort of this work is to relate the influence of the flow of solid particles in the lubricant to the parameters determining the lubrication regime. For the experiments, a taper-on-disc device was constructed to simulate linear contact. Using this device, the effects of different solid particles on the damage of a sample (roughness parameters Ra and Rq) with linear contact and the influence of this altered structure on the lubricating film thickness (hmin) are experimentally described. These remarks are partially compared with the effect of particles on point contact. The result of this paper is a better understanding of the solid particle flow in the Hertzian contact region and clarification of the influence of this flow on the surface structure and associated lubricating film thickness, especially for linear contact.
|
|
|
A new life for the factory = a new life for Portlaw
Galusková, Hana ; Plášil, Jiří (referee) ; Boháč, Ivo (advisor)
Master´s thesis describes the revitalization of a former cotton factory site and later tannery. The abandoned factory building, the chimney, the former engine room, the canal, and other secondary buildings are uncontrollably absorbed by nature. The place has an exceptional charm thanks to the contrast of raw materials and the amount of greenery, but the lack of maintenance of individual structures shortens their lifespan. The main idea of the design is the conservation of the preserved objects of the factory, support of historical values, and preservation of nature in a man-made space. The proposal describes the creation of a multi-purpose area that creates employment opportunities, a form of recreation and public space for the residents of Portlaw, as well as an attraction within the region and for tourism. The functional content is a botanical garden with an exterior and interior part, a public space with a market, small spaces for rent, a food court, accommodation, and areas with hydroponics. Each functional unit works independently, and at the same time, complements each other - grown products from hydroponics are sold at the market, visitors to the botanical garden use accommodation, and people who rent spaces visit the food court. The goal was to bring new life to the factory and thus revive the town of Portlaw. The functional content of the entire area uplifts the history as well as the current state of the place.
|
|
|
Design of autonomous robot for cleaning solar panels
Kuchárik, Martin ; John, David (referee) ; Křenek, Ladislav (advisor)
The main objective of the diploma thesis is the design of the concept of an autonomous robot intended for the cleaning of photovoltaic panels in solar parks. The proposal aims to respond to current market events, which demonstrate that the global shift to renewable sources of energy goes in line with the exponential growth of photovoltaic construction. Solar panels require regular maintenance, and that is what cleaning robots are used for, yet they currently have a variable form. The diploma thesis focuses on creating a concept of an innovative versatile self-driving cleaning vehicle powered by sustainable energy sources. The proposal introduced within this diploma thesis takes ecological aspects into consideration with the emphasis on aesthetics, purposefulness and intuitive usage.
|
|
|
Preservative systems for natural cosmetics
Koblasová, Dana ; Veselá, Mária (referee) ; Zemanová, Jana (advisor)
The aim of this bachelor thesis is to evaluate the antimicrobial activity of naturally derived preservatives against selected microorganisms. Theoretical part is focused on description of the most used natural, naturally derived and synthetic preservatives, on the safety of preservatives and finally, the issue of contamination of cosmetic products by microorganisms. In experimental part, antimicrobial activity of 4 naturally derived preservatives was evaluated against selected microorganisms, which were bacteria Micrococcus luteus, Kocuria rosea, Bacillus cereus, Bacillus subtilis, Serratia marcescens and one yeast Candida vini. The tested preservatives were from MinaSolve company - E-LEEN Green A, which contains pentylene glycol and phenylpropanol, E-LEEN Green OR, which is composed of citrus extracts, citric acid, ascorbic acid and pentylene glycol, Green B, which contains benzoic acid, sodium benzoate and pentylene glycol and Hexam+, which is a mixture of pentylene glycol and hexamidin diisethionate. Antimicrobial activity was evaluated by agar diffusion method. The highest antimicrobial activity showed Hexam+, the lowest E-LEEN Green OR. E-LEEN Green A and Green B did not show any antimicrobial activity against any microorganism in the 1% tested concentration. The measured values of the inhibition zones show that the most resistant microorganisms from all the tested in this thesis are Bacillus cereus and Bacillus subtilis and the least resistant are Micrococcus luteus and Kocuria rosea.
|
|
|
The Change
Maceňková, Katarína ; Fexová, Patricie (referee) ; Artamonov, Vasil (advisor)
In work entitled CHANGE, I return in my memories to my home region, a town where I have lived and lived most of my life and which has been nicknamed the "Triangle of Death" for decades. This time period has had and continues to have a significant impact on my existence. In the first phase of the timeline of creating the topic of the diploma thesis, are my returns through induction and deduction. I approach my father's illness, which is not uncommon in my homeland. I connect connections leading to finding out the causes of origin and occurrence. Subsequently, I recall memories related to the stories heard from people about the factory, which was supposed to be and perhaps was the livelihood for the inhabitants of the poor eastern Slovakia, as well as the production of PCBs. I create, compile and depict images hidden in the memory of moments from my lived childhood. I depict the Chemko Strážske factory, which at that time was a kind of illusion of a happy life. I am looking for a way of acceptance and ways of reconciliation using painting techniques, through the representation of symbols and the central characters that represent it all.
|
|
|
Evaluation of cutting fluids aerosol contamination of working environment during metal turning
Svoboda, Svetozár ; Mukhametzianova, Leisan (referee) ; Kotek, Luboš (advisor)
The thesis deals with the contamination of the workspace with a liquid aerosol, which is generated by scattering and evaporation of the cooling fluid. Cooling fluid are primarily intended to lubricate, cool and clean the tool and the workpiece, but the unwanted side effect is the formation of a liquid aerosol that holds in the air of the workspace. In such a contaminated work environment, the operator is exposed to a certain dose of a liquid aerosol that causes dermatological and respiratory problems. The topic of the thesis was to find out the number of particles of liquid aerosol that arises under varying working conditions and its dispersion in space. This amount was determined by image analysis using a high-speed camera.
|
|
|
Hair as a bioindicator of contamination of risk metals
Zmijová, Marie ; Řezáčová, Veronika (referee) ; Zlámalová Gargošová, Helena (advisor)
The use of hair as a bioindicator of environmental contamination by risk elements is becoming more and more common. This bachelor thesis deals with the use of this matrix for analysis using the voltammetric method. It focuses on the optimization of the method for determining the concentration of cadmium, copper, lead and zinc in real hair samples and monitors the effects on the incorporation of these elements into the hair fiber. The presence of zinc and copper was confirmed in all samples analyzed. Cadmium could only be quantified in one sample. The effect of gender and age on the concentration of elements has not been demonstrated. Concentration of lead has been linked to smoking, with higher concentrations found in smoker’s hair than in non-smoker’s.
|
|
|
Assessmant of surfactants levels in waters
Zajícová, Markéta ; Doležalová Weissmannová, Helena (referee) ; Vávrová, Milada (advisor)
The present Bachelor Thesis deals with problem of water contamination by synthetic surfactants. Surfactants represent the main component of washing and cleaning agents, from which they enter waste waters. The goal of Thesis was to monitor and evaluate volume of surfactants in waste waters from waste water treatment plant VFU Brno. Samples were being taken in the course of 7 days and we have monitored volume of anionic and cationic tensides in samples from influent and effluent stream of waste water treatment plant. For qualitative and quantitative determination were used mobile analytic measurement devices with photometric detection by company Merck. Results were processed and interpreted in data evaluation section in the end of this Bachelor Thesis.
|
|
|
Pollutants in laboratory waste waters
Červenka, Jiří ; Zmrzlý, Martin (referee) ; Sponar, Jan (advisor)
Mercury is a very consequential pollutant. It´s contained in all components of environment. Analysis of mercury is very demanding. Since mercury is ranked among dangerous chemicals, its quantity is limited and checked not only in environment. The aim of this thesis was to determine concentration of mercury in water from labs and in influent and effluent water from neutralization station of Brno university of Technology, Faculty of Chemistry. Water from neutralization is also mixed with sewage. Advanced mercury spectrometer AMA 254 was used or analysis. Results confirmed, that water flows out from lab to neutralization with relatively high concentration of mercury, highly exceeding limits of drainline. Water from neutralizing station also doesn´t show so high concentration of mercury, because it is mixed with waters from other labs and pH of water is amended. Special waste bottles for liquid waste with risk elements and dangerous compounds are available; from results can be decided, that not everybody follows the rules and some people might pour the waste right in to the sink. Resolution could have been safer acquisitions in labs. Students, who manipulate with dangerous chemicals should be alive to risk, which threatens with pouring into the sink, contamination and dangerous for all components of environment.
|
guest ::
