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Thick-film sensors for heavy metals detection
Gajdoš, Libor ; Majzlíková, Petra (referee) ; Prášek, Jan (advisor)
This project describes the possibilities of heavy metals detections in solutions using differential pulse voltammetry with tree-electrode electrochemical thick-film sensors. In the theoretical part, the thick-film technology is described as well as thick-film pastes’ types and compositions, followed by introduction to electrochemistry and electro-analytical methods of measurement. This project also describes the three measured heavy metals – cadmium, lead and copper. In the practical part, heavy metals’ ions detection in solutions using carbon working electrode and determination of the detection limit and sensitivity are described and discussed. Finally the evaluation of obtained results and results comparison to hygienic limits are included.
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Bio-electromagnetic compatibility
Matulík, Martin ; Rozsívalová, Zdenka (referee) ; Matulík, Radomír (advisor)
Following work deals with problems of effects of electromagnetic radiation on living organisms. It goes into interactions of electromagnetic radiation with environment, effects on living organisms, physical units of biological tissues and sorting types of electromagnetic radiation to determine means of protection against adverse health reactions. It enlighten means of establishing sanitary restrictions, differences in legal aspects at Czech republic and worldwide, possible medical utilization, even principles of selected diagnostic and therapeutic techniques. It looks into shielding effects of common materials, ordinarily used for protection against ionizing radiation via findings of practical measurements. Series of radiofrequency measurements has been done with precise spectrum analyzers, which should reveal some basic problems of frequency bands, ordinarily used in current period.
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Noise study of heat pump
Gregorovičová, Eva ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
The thesis deals with a noise study of a heat pump, which is important for the assessment of the acoustic comfort of people. The thesis describes the theory of basic terms, quantities, measuring devices and the chosen method of determining sound power. The acoustic properties and technical condition of the measured heat pump, its possible noise sources and the possibilities of reducing their emissions are also described. The total noise level of the device is determined by the intensity probe according to the scanning method according to ČSN ISO 9614-2. Based on the acoustic map and frequency spectrum, the partial noise sources of the heat pump are identified. The resulting values from the measurements are compared with the manufacturer's values. The noise situation is assessed by measuring and comparing the measured values with the hygienic limits. Furthermore, the designs of the noise protection measures are assessed, and the design of the noise protection measures for the specific case is carried out. Finally, possible noise protection measures are implemented and experimentally verified. The results confirm the need for further development of heat pumps to reduce noise emissions.
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Noise study of heat pump
Gregorovičová, Eva ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
The thesis deals with a noise study of a heat pump, which is important for the assessment of the acoustic comfort of people. The thesis describes the theory of basic terms, quantities, measuring devices and the chosen method of determining sound power. The acoustic properties and technical condition of the measured heat pump, its possible noise sources and the possibilities of reducing their emissions are also described. The total noise level of the device is determined by the intensity probe according to the scanning method according to ČSN ISO 9614-2. Based on the acoustic map and frequency spectrum, the partial noise sources of the heat pump are identified. The resulting values from the measurements are compared with the manufacturer's values. The noise situation is assessed by measuring and comparing the measured values with the hygienic limits. Furthermore, the designs of the noise protection measures are assessed, and the design of the noise protection measures for the specific case is carried out. Finally, possible noise protection measures are implemented and experimentally verified. The results confirm the need for further development of heat pumps to reduce noise emissions.
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The traffic noise influence on the health of the exposed population
DIVÁCKÝ, Jan
This presented diploma thesis deals with evaluation of the traffic noise influence on the health of the exposed population. The objectives of this thesis are based on the results of Environmental Health System in the Czech Republic (Subsystem III), which provides the long-term monitoring of the noise in the municipal environment of the chosen agglomerations. A part of the noisy location monitoring is also the questionnaire survey confirming hypothesis n.1: "At the traffic noise perceiving, there is an important psychosocial bound, which often stands in opposition to the results of the noise measurements". Furthermore, the thesis describes the results of the indicative measurement of the chosen noisy localities in comparison with same locality measurements in the technical accuracy class. The indicative gauge tests were made on the traffic-busy roads in Jihlava city. The measurement has proved the link between the intensity of the traffic flow and indicatively determined noise levels and practical applicability for the local planning or local controlling incentives solution. The results of the indicative measurements point out to breaking of the equivalent night noise levels for sleep disturbance in three chosen localities. Breaking of the equivalent day noise levels has a nature of the noise annoyance. The measured road-traffic-caused night and day noise levels may be compared to the recommendations for the risks of increased incidence of selected civilization diseases published by the World Health Organisation.
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Bio-electromagnetic compatibility
Matulík, Martin ; Rozsívalová, Zdenka (referee) ; Matulík, Radomír (advisor)
Following work deals with problems of effects of electromagnetic radiation on living organisms. It goes into interactions of electromagnetic radiation with environment, effects on living organisms, physical units of biological tissues and sorting types of electromagnetic radiation to determine means of protection against adverse health reactions. It enlighten means of establishing sanitary restrictions, differences in legal aspects at Czech republic and worldwide, possible medical utilization, even principles of selected diagnostic and therapeutic techniques. It looks into shielding effects of common materials, ordinarily used for protection against ionizing radiation via findings of practical measurements. Series of radiofrequency measurements has been done with precise spectrum analyzers, which should reveal some basic problems of frequency bands, ordinarily used in current period.
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Thick-film sensors for heavy metals detection
Gajdoš, Libor ; Majzlíková, Petra (referee) ; Prášek, Jan (advisor)
This project describes the possibilities of heavy metals detections in solutions using differential pulse voltammetry with tree-electrode electrochemical thick-film sensors. In the theoretical part, the thick-film technology is described as well as thick-film pastes’ types and compositions, followed by introduction to electrochemistry and electro-analytical methods of measurement. This project also describes the three measured heavy metals – cadmium, lead and copper. In the practical part, heavy metals’ ions detection in solutions using carbon working electrode and determination of the detection limit and sensitivity are described and discussed. Finally the evaluation of obtained results and results comparison to hygienic limits are included.
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Hygiene Factors Issues of Noise, Dust and Vibrations in the Workplace Grinding Castings
STODOLOVSKÁ, Květa
My diploma work is focusing on the health problems of selected factors in the working enviroment of grinding the metal castings. There are high-risk factors, which are harmful to worker´s health, especially physical stress, noise, dust and vibrations, which are passed on hands. The employer is under the obligation to take precautions to carry on worker´s health, in consideration of exceed the health limits. The aim of this diploma work was setting the efficiency of precautions to health protection in work enviroment. The situation had been monitoring in a company in the South Bohemia over ten years. There were used results of factor´s precautions (noise, dust, vibrations) in work enviroment, where workers grind the metal castings by hand grinders. The monitoring ensemble was created by employess in a company, which makes the metal castings by hand grinders in its work enviroment. To data collecting were used the following methods: non-aligned observation, conversation with the chief of the company, studying of positive law and technical literature incl. test codes of the health institute (department Ceske Budejovice). The data of the test codes were processed by the secundary analysis and summarized to tables and graphs. Within qualitative analysis I determinated four research questions, which were answered gradually in my work: 1)Which precautions are carry out by employers to particular factors of employee´s health protection? 2)What is the factor´ s efficiency? 3)What impact do the precautions have on results of factor´s measuring? 4)Which precautions can I recommend on the grounds of the evalutation of the work enviroment? Both means of collective and individual protection belong to the precautions of worker´s health protection today. The technical, technologiacal and organisational precautions are included to collective protections. The individual precautions are focusing especially on employees and offer the substitute solutions. All precautions are specific to individual factors. I found out, that all precautions, which are used by the employers in work enviroment of metal casting, are effective. Especially we can talk about the precautions to protection of employee´s health against excessive dust (instalation of air ventilation with strong effect), which caused the exceed of dust concetration in work enviroment of grinding. Finally I can say, that this branch of metal casting has been connecting with certain high-risk factors all the time. Although all the protective precautions has been realized, the health limits given for noise, vibrations passed on hands and dust are still exceed. For this reason it´s very important to regularly inform the workers of high-risk factors, which they could meet in their work enviroment of cast grinding.
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Evaluation of fish contamination in selected fishing districts
ČERVENÝ, Daniel
The object of this thesis is the assessment of fish contamination by selected foreign substances as toxic metals, polychlorinated bifenyls and dioxines in selected fishing districts. For the thesis' purpose the attractive fishing districts Vltava 20 - Kořensko (421090), Údolní nádrž Rozkoš (451200), Odrava 1 ? ÚN Jesenice (431200) and Vltava 28 P (423040) were selected. Fish were caught by electric device and fishing rods. Foreign substances content monitoring was made in fish muscle tissues from selected locality. Concentrations of Hg, Cd, Pb, PCB, DDT, HCH, HCB, and dioxines in fish muscle tissues were monitored.
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