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Multistress ageing analysis of the electroinsulating materials
Jeřábek, Michal ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This diploma thesis deals with not-aged and thermally, electric and multistress aged slotted isolations dielectric properities experimental probing. Dutiny experiment is watched influence moisture on dielectric properties insulating materiále ISONOMŽNMN. Especially both two permitivity complex components are surveyed, in dependence on the frequency and the temperature changes during thermal, electric and multistress ageing. These characteristics are viewed in light of application the isolation in practice.
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Weather measurement
Chovanec, Jan ; Havránek, Zdeněk (referee) ; Bejček, Ludvík (advisor)
The achievement of this thesis is to design functional equipment which is able to measure the basic meteorological variables as air temperature, humidity and barometric pressure. In order to measure relative humidity completed with temperature, an intelligent sensor manufactured by Intersema Inc., MS5534B, was chosen. Relative humidity is measured by a capacitance sensor Humirel HS1101LF. The measured data are stored in anon-volatile memory. Data can be downloaded to a computer file via serial port or they can be online displayed on the computer screen via the wireless Bluetooth connection. Because the equipment is supposed to be used for the external measurement without the connection to electricity, low power consumption was considered as a most important parameter as well as good weather protection.
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Electronic instrument for environment monitoring during plants growing
Žák, Jaromír ; Kuchta, Radek (referee) ; Hubálek, Jaromír (advisor)
The main goal of this project is to make electronic instrument for monitoring environment during plants growing for Mendel University of Agriculture and Forestry in Brno. The new device will replace current analog recorder of temperature and humidity. New device will be extended by measuring atmospheric pressure, illumination and CO2 concentration. Main advantage of electronic measuring is better lucidity of gained values. New concept allows easier comparison new values with earlier measured data.
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Evalutation of storage potato varieties Red Anna and Dali
BOŠKOVÁ, Veronika
The aim of the bachelor's thesis was to assess the storage of chosen potato varieties Red Anna and Dali depending on harvest time. Both varieties were grown in the fields near the village Chlumany (South Bohemia, District of Prachatice), then the tubers were stored in local storage facility and there the potato samples were also observed. The experiment was carried out in 2013-2014. The samples were taken as four variants of each variety. The variants differed in their harvest time. Tuber weight loss influenced by essential and pointless losses was monitored in each sample. It was confirmed that potato storage was influenced by suitable harvest time and partially also by the weather during the harvest. The worst result was shown by the first harvest of medium ripening variety Red Anna. The tubers were not ripe enough and completely unsuitable for a long-term storage. Those tubers were very shrunk already in December and therefore not usable for further processing. On the contrary, the last harvest of both potato varieties was the most convenient for storage. The samples taken from the last harvest showed the lowest loss during the storage and those potatoes were very nice while observed and measured for the last time. The bachelor's thesis also mentions important factors that can influence the storage of potatoes (temperature, relative humidity, ventilation, mechanically damaged tubers, potato diseases).
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Season changes in milk efficiency and fertility of the cows in relation to the temperature and humidity environment conditions
ŤOUPALOVÁ, Michaela
High level of fertility and milk efficiency be ranked among major premise profitability of the company. If are not i extenso independent all necessaries of life dairycows, it is impossible expect favourableness. Human factor have in locking needs dairycows most important and fungible role, above all in the area corresponding sustenance and correct rearing technique and attendance fiduciary animals. On fertility and milk efficiency affect all row of other factors, from which ours imposition was evaluate seasonal establishment temperature influence and relative humidity. Average milk yield in herd Holstein cows attained 6 254 kg milks behind standardized lactation 305 days. Avarage deily vessel descending reduction on standardized lactation do 20,5 litre. Highest values reached average daily milk yild in spring 22,09 litres milk during lactation. Big throughs was recorded in summer, average daily vessel doed mere 16,96 litres milk during lactation. By the help of ANOVA test was ascertained statistically significant difference on significance level P 0,05 among spring and summer, among spring and winter, among summer and autumn and among summer and winter. Effected regression analysis confirmed fall average daily milk yield depending on raising temperatures inside stabling. Maximum cows at average daily efficiency about 20 - 23 litres milk here of achievement reached at 10 - 12 °C. Optimum thermal balk strode low-water mark of 28 x plus upper boundary 247 x. Temperature above 20 °C was overstepped 104 x. Optimum D shell relative humidity crossed ceiling 211 x. Average meantime in heard attained 419 days, SP 127 days and insemination interval 78 days, near over most 50 % cows was level fertility evaluation like bad. According to results ultrasonografik investigation gravided every 3. - 4. cow, which is wanting. In case executant defects was highest percent occurrence recorded near sweeping and ovarian cysts. Influence of season, let us say temperatures on fertility indices plus defect incidence wasn´t evidenced. Bad level fertility had in the framework year continual course.
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Indoor air quality in kindergartens and primary schools L. Kuby 48, České Budějovice
TUREK, Jan
The bachelor thesis deals with the quality of the internal environment at primary school and kindergarten L. Kuby 48, České Budějovice which are connected in one area. Its substance is the measurement of carbon dioxide, humidity and temperature in relation to the time and its impact on pupils based on my own observations and findings. The thesis also includes a survey on the basis of which was evaluated the connection of primary and nursery schools. The establishment of primary school is dated in 1927. The Kindergarten was established in 2011 in the former area school clubs built in 1969. Quality of internal and external environment is getting worse and is still a hot topic. Indoor air is dependent on many factors which is influenced by. The thesis is divided into two main parts. The first, the theoretical part deals with general and specific knowledge of pollutants occurring in the internal environment of buildings, their increase or decrease and the reasons for change and the overview of concentrations reported in the literature and legislation. In my thesis are mentioned the individual components of indoor air, their causes, sources. Of these substances I focus on a substance which most influences the quality of indoor climate and that is the carbon dioxide or CO2. This compound is introduced in my thesis. There are presented its usual concentration in the interior and the exterior, sources and health consequences which may be caused by high concentrations. The carbon dioxide has according to applicable legislation limiting concentration of 1000 ppm. During the measurements acquired by values in the indoor environment from 705 ppm to 3225 ppm. The threshold of concentration for this thesis was set at 1500 ppm. In the second, the empirical part, were used two methods of processing. The first method was a secondary analysis of data obtained from primary school and kindergarten L. Kuby 48 and on the basis of my investigation. The results of measurement and investigations are presented in my thesis. I present the measured values which were investigated. The survey was conducted in six rooms. For each surveyed room is described the current situation at the time of measurement, specified and graphically measured values. For the measurements in most cases was set up so called the step of measurements for period of two minutes i.e., every two minutes were recorded actual measured values of studied variables, which were then processed and evaluated. In all classes were found to exceed the limit concentrations of carbon dioxide. The temperature and the humidity were acceptable according to the legislative regulations. The second method is the method used for querying the use of quantitative research by technique of an anonymous questionnaire stated in the annex. During this investigation was asked a total of 140 respondents. For the assessment has been used 127 questionnaires. Between those interviewed were children of secondary school, also parents of children from primary school and parents of children from kindergarten. Questionnaires were statistically analysed and evaluated on the basis of the hypothesis. By the following research, were both stated hypotheses confirmed. In the case of the first hypothesis that the combination of primary and nursery schools in one area is an advantage for parents and children 75.78% of respondents answered YES. The remaining 24.22% answered NO or did not answer. When querying on the second hypothesis, whether the parents are satisfied with the operation of primary schools and kindergartens L. Kuby 48, 82.35% of respondents answered YES. The remaining 17.65% of the respondents answered NO or did not answer again. The respondents' answers and evaluation of questionnaires is graphically recorded in the thesis. Parts of this thesis are attached photographs which document the progress of measurements.
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