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Analýza vláhové potřeby polních plodin v oblasti s častým výskytem sucha. / Analysis of water requirements of the field crops in areas with frequent occurrence of drought.Zábranský, Petr January 2016 (has links)
Summary
Water resources are an important part of ecosystems. In the water balance of the landscape, the variability of climate, soil factors, as well as high diversity of vegetation play an important role. Evapotranspiration represents a major passive component in the water balance of the basin. Unlike forests, where the water balance is particularly predictable due to the long-term development of the stands, regular crop rotation in agricultural systems and agricultural practices may cause rapid changes in water balance during much shorter time. It may sometimes result in irreversible changes in ecosystems with impact on landscape biodiversity. An understanding of the limiting environmental factors and exact determination of the water demands of plants makepossible not only an improvement of yield parameters, but it is also condition for understanding of the agroecosystems sustainability in the cultural landscape.
Field measurements of actual evapotranspiration were carried out in the period 2007 to 2015 in Velvary (Budihostice) in the Central Bohemia region, 210 m above sea level in the rain shadow area around Slaný territory. In terms of the average annual water balance (CHMI, 2014), the locality is regarded as the area with the difference between the average annual precipitation and annual potential evapotranspiration totals in amount of -200 mm, so the potential evapotranspiration slightly exceeds precipitation. Field measurements were conducted on commonly managed areas with a minimum size of the experimental plots of 1 ha.
The measurements confirmed differences between the crop water demands during the growing season. Different values of the actual evapotranspiration as well as the Bowen ratio values were estimated for the observed crops depending on the growth stage of crops. The lowest values of actual evapotranspiration were detected for Zea mays and Sorghum bicolor. Higher water demands were shown by Triticum aestivum and Hordeum vulgare. On the contrary, the highest values of actual evapotranspiration were found in stands of Beta vulgaris and Medicago sativa. According to the values obtained for crop coefficients (Kc), the crops of Z. mays, S. bicolor and T. aestivum had about a quarter lower values of Kc compared with M. sativa and B. vulgaris crops in the main growing season. In this work, the daily values of Kc, which are the basic characteristics of moisture requirements for individual crop were determined and can be used modelling of hydrological processes in agro-phytocoenoses. The evaluation of moisture requirement of crops by the water flow in plants (determined by the sap flow method) showed the expected differences between S. bicolor and Z. mays plants. Water use efficiency (WUE) was significantly higher in plants of C4 type (Z. mays and S. bicolor) compared with the rest of observed plants of C3 type (T. aestivum and H. vulgare).
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Nízkošumový referenční zdroj typu bandgap / Low-noise bandgap referenceKnop, Jaroslav January 2008 (has links)
This work deals with principles of design low noise bandgap reference using multiple in the process EPI92. The voltage reference is described and theoretic analysis noise performances is made. Results are compared with measured data realized breadboard BG reference and fabricated low drop-out regulators, which using different accurate bandgap references cells.
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Analýza obtokového kanálu turbodmychadla / Analysis of turbocharger waste gateOndrejka, Adam January 2015 (has links)
The aim of master’s thesis was to put forward calculation methodology of wastegate turbocharger bypass channel discharge coefficient. Designed methodology was based on discharge coefficient analysis conducted utilizing CFD simulations of turbocharger turbine-side parametric model. It was achieved to propose a calculation, which differentiates relatively in average 1,4% from CFD data. New methodology improves the accuracy bypass channel design and helps to choose appropriate wastegate valve actuator.
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Hodnocení technické úrovně vozidel značky AUDI pro účely oceňování / Estimation of the technical level of AUDI vehicles for valuation purposesFojtík, Adam January 2015 (has links)
This thesis analyzes used ways of cars classifications. Proposal suitable sorting methods production the Audi brand for application of valuation methods. Furthermore, the coefficient of determination technical level. For coefficient of technical levels was chosen method of parametric paired comparison, based on Saaty method and the method of calculating historical cost.
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Dopady změny klimatu na četnost a intenzitu sucha na území ČRKrejčí, Michal January 2018 (has links)
The main goal of this thesis is the analysis of trends of relative atmospheric humidity, absolute atmospheric humidity and water vapor pressure from years 1981-2015. Only days without precipitation were included in the input data set. The data used in the analysis comes from eight meteorological stations located in the Czech republic: Doksany, Churáňov, Kocelovice, Kostelní Myslová, Kuchařovice, Liberec, Lysá hora and Přibyslav. The statistical significance of the trends was evaluated with the Pearson’s correlation coefficient. The results show no clear evolution of the trends of the relative humidity. On the other hand, the trends of absolute humidity and water vapor pressure show significant rising trends in July (at six stations) and November (at seven stations). The July trends are probably caused by higher temperature during summer and the cause of the November trends might be caused by higher precipitation in autumn.
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Exchange Traded Funds a likvidita indexových portfoliíBodeček, Ondřej January 2018 (has links)
The thesis investigates if introduction of Exchange Traded Fund, which replicates given index, has impact on liquidity and risk of underlying component securities. This thesis specifically examines impact of introduction ETF called Lyxor ETF WIG20, which was introduced at Warsaw Stock Exchange. ETF holds stock of WIG 20 Index. The impact on liquidity is investigated by using univariate analysis and by using multivariate panel regression, where dummy variable is used. The impact on risk of component stock is analyzed by beta coefficient.
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Aplikácia modelu CAPM na evrópsky akciový trhLaurová, Terézia January 2015 (has links)
Laurová, T. Application of model CAPM on European stock market. Diploma thesis. Brno: Mendel University, 2015. The fundamental of this thesis is application of CAPM model on European stock market. Diploma thesis consists of two parts. The first one is the theoretical part, which is describing the basics of CAPM model, which serves for better understanding of the model and portfolio management. In the second, practical part, there will be solved the basic characteristics of model. There will be also created portfolios in Microsoft Excel. Finally there will be evaluated the veracity of the specified hypothesis and comparison of incurred portfolios.
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Vstupní data jako determinant výsledků měření daňové progresivityOpluštilová, Monika January 2018 (has links)
Opluštilová, M. How the measurement of tax progressivity is determined by input data. Diploma thesis. Brno: Mendel University, 2018. The diploma thesis deals with the influence of input data on the final values of the measurement of tax progressivity. For the calculation of the Gini coefficient and other selected indicators for 2015 are used data from Household Budget Survey and the Statistics on Income and Living Conditions (EU-SILC), which are published by the Czech Statistical Office. It was also examined the impact of equivalence scales on the Gini coefficient before taxation and after taxation, as well as the impact of the change in the quantile distribution of income from deciles to quintiles, which occurred in 2016 in Household Budget Survey. The results of the thesis show the significant impact of the chosen survey and the quantile distribution of income. On the other hand, it shows the negligible impact of equivalence scales.
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Komparatívna analýza stavu a vývoja súkromného a verejného vysokého školstva na Slovensku / Comparative analysis of the situation and trends of higher private and public education in the Slovak RepublicPulcová, Petra January 2014 (has links)
The target of the thesis is to describe present higher education system in Slovakia and the way of breakdown of subsidies for public universities and higher schools with focus on comparison with the Czech Republic. First part is about historical development and present state of higher education in Slovakia. Second part is focusing on grants for carrying out accredited study programs and the last part is analysis of study field coefficient and coefficient of employability of graduates. According to used methods I found out that different ways how to evaluate performance of higher schools and universities leads to different results, though they are using the same characteristics.
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Popis vazby průtoků a plavenin ve vybraných profilech vodních toků / Description of Relation between Flow and Suspended Sediment Load in a Hydromertic Profiles of a Selected RiversBobková, Dominika Unknown Date (has links)
The issue of the relationship between water discharge and the suspended sediment loads is a globally highly addressed topic. Knowing the suspended sediment loads in the streams avoids problems with over-filling of water cannons and thus prevents insufficient capacity of water reservoirs. This thesis is partly a follow-up to the bachelor thesis, which extends and introduces new procedures. Neural networks, more specifically multilayer perceptron neural networks, are used to analyse the relationship between water discharge and suspended sediment loads. The results of the networks are then processed in Excel into graphs and evaluated using the coefficient of determination, Nash-Sutcliffe coefficient and RMSE coefficient. The practical application is solved on two profiles - the profile Podhradí nad Dyjí and the profile Židlochovice. Each profile is examined in a different period.
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