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Electrical motors parameters identification using subspace based methods
Jenča, Pavol ; Veselý, Ivo (referee) ; Blaha, Petr (advisor)
The electrical motors parameters identification is solved in this master’s thesis using subspace based methods. Electrical motors are simulated in Matlab/Simulink interactive environment, specifically permanent magnet DC motor and permanent magnet synchronous motor. Identification is developed in Matlab interactive environment. Different types of subspace algorithms are used for the estimation of parameters. Results of subspace parameters estimation are compared with least squares parameters estimation. The thesis describes subspace method, types of subspace algorithms, used electrical motors, nonlinear approach of identification and comparation of parameters identification.
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Comparison of Differences in Seasonality of Demographic Time Series of The Selected Countries in EU
Morávek, David ; Šimpach, Ondřej (advisor) ; Miskolczi, Martina (referee)
In the theoretical level this thesis describes some of the statistical methods using for time series analysis with seasonal component and some of the statistical methods using only for analysis of seasonal component. In the analytical level, these statistical methods are applied to demographic time series. The seasonal component is analysed in more detail, and the progress and type of the seasonal component is compared between several european country. This thesis brings and shows some of the interesting trends, which are appeared in analysed demographic time series. Last but not least, this thesis also provides the preview on the application of some not usually using statistical methods.
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Financial Analysis of JIPOCAR TRANSPORT, Ltd
Chromá, Lucie ; Pevná, Jana (advisor) ; Hartmanová, Jana (referee)
The target of this diploma thesis is an evaluation of company's financial health. The diploma thesis is divided into two parts - theoretical and practical. The theoretical part presents theoretical findings, which are apllied in the financial analysis. These findings are applied in the practical part to the transport and forwarding company JIPOCAR TRANSPORT, s.r.o. The result of the financial analysis is compared with average values in the industry.
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Effect of environmental factors on the rate of cellulose decomposition in selected wetlands
FILIPOVÁ, Marie
This thesis is a part of the project No. P504/11/1151 of The Grant Agency of the Czech Republic, entitled The role of plants in the greenhouse gas budget of a sedge fen. In this thesis, the decomposition rate of a standard material (cellulose) is assessed for three types of wetlands, which differ in water regime. The study took place at two localitites of marginal wetlands with standing water (Mokré louky near Třeboň, Záblatské louky), two floodplain localities (Brouskův mlýn and Hamerské louky) and two peatbog localities (intact and mined parts of Červené blato, respectively). The intensity of decomposition processes was compared among the sites using the method of cellulose bags. The bags were made from nylon nets, each was divided into five pockets and a cellulose strip was inserted in each pocket. A filter paper was used as the cellulose. These bags were placed vertically into the soil profile so that the upper sample was lying on the surface and the lowest was at the depth of 25 cm below the surface. At each locality four places were randomly selected and four replicate bags with cellulose were placed on each of them. In total 96 bags were put in place, which makes 480 cellulose samples. Two experiments, differing in length of exposition, were carried out in 2013. The samples were taken from the field sites after three and five weeks of exposure (experiment No. 1 and 2, respectively). In both experiments, the decrease in ash-free dry matter was the highest at Hamerské louky. The lowest decrease in ash-free dry matter was in the mined part of Červené blato peatbog. In the second experiment the decrease of the ashless dry matter was more noticable, which was caused by the prolonged exposure. The lowest decrease of ash-free dry matter was found in depths of 0 - 10 cm below the soil surface at all the sites.
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Modelování přírodních katastrof
Zuzák, Jaroslav ; Zimmermann, Pavel (advisor) ; Masec, Frant (referee)
This thesis introduces various approaches to natural catastrophe risk assessment in (re)insurance environment. Most emphasis and further elaboration is put on probabilistic models in comparison to the standard model as proposed by Solvency II. The outcomes of natural catastrophe modeling play an important role in the design of proper actuarial models related to catastrophe risk. More specifically it is shown that they can be entirely understood in a wider actuarial context, namely risk theory. Within the Solvency II framework, probabilistic model outcomes are translated by means of the proposed decomposition methodology putting them into a similar language of the standard formula in order to create the ability to compare different results implied by either probabilistic model or standard formula. This enables both comparison of the implied dependence structure of probabilistic model to standardized correlations assumed in Solvency II, and scenario year loss factors of Solvency II to implied damage factors of probabilistic models in defined cresta zones. The introduced decomposition methodology is illustrated by flood and windstorm model outcomes calculated on exposure data of Czech insurance companies and compared to the respective standard formula parameters and outcomes. Finally, other applications of the proposed decomposition methodology are introduced, such as measurement of diversification effect or blending of different results calculated by different models or even approaches to natural catastrophe risk assessment.
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Cellulose decomposition in selected wetlands
FILIPOVÁ, Marie
This work deals with the decomposition of cellulose in wetland. The speed decomposition has been studied in several areas. Mokré Louky u Třeboně, Záblatské louky, Červené blato mined and not mined. The intensity of degradation processes were determined using the litter-bags. The experiment was done for two years and each year was used another method. Bags with cellulose were placed in the soil and the soil surface. In this work the values were determined in different places and at different times.
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Decomposition of aboveground biomass of a herbaceous wetland stand
KLIMOVIČOVÁ, Lucie
The master?s thesis is part of the project GA ČR č. P504/11/1151- Role of plants in the greenhouse gas budget of a sedge fen. This thesis deals with the decomposition of aboveground vegetation in a herbaceous wetland. The decomposition rate was established on the flooded part of the Wet Meadows near Třeboň. The rate of the decomposition processes was evaluated using the litter-bag method. Mesh bags filled with dry plant matter were located in the vicinity of the automatic meteorological station at four randomly selected sites. Values of the decomposition rate were assessed in two experiments. In the first experiment the litter bags were fixed in April 2009. The litter bags were fixed in the vertical position and they had one size. Values of the decomposition rate were assessed for 6 sampling dates and the total exposure time was 2,5 years. The decrease of the total dry mass was 18,37 % in the first year and 13,05 % in the second year. The value of LDR was 0,7227 in the first year and 0,4740 in the second year. In the 2nd experiment the litter bags were fixed in November 2010. The litter bags were fixed in the vertical and horizontal position, respectively, and they were of two sizes (small, big). Values of the decomposition rate were assessed for 2 sampling dates and the total exposure time was one year. The total annual value of LDR was 0,5212 for the vertical bags and 1,0676 for horizontal bags.
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Decomposition Methods in Turbulence Research
Uruba, Václav
Nowadays we have the dynamical velocity vector field of turbulent flow at our disposal coming thanks advances of either mathematical simulation (DNS) or of experiment (time-resolved PIV). Unfortunately there is no standard method for analysis of such data describing complicated extended dynamical systems, which is characterized by excessive number of degrees of freedom. An overview of candidate methods convenient to spatiotemporal analysis for such systems is to be presented. Special attention will be paid to energetic methods including Proper Orthogonal Decomposition (POD) in regular and snapshot variants as well as the Bi-Orthogonal Decomposition (BOD) for joint space-time analysis. Then, stability analysis using Principal Oscillation Patterns (POPs) will be introduced. Finally, the Independent Component Analysis (ICA) method will be proposed for detection of coherent structures in turbulent flow-field defined by time-dependent velocity vector field. Principle and some practical aspects of the methods are to be shown. Special attention is to be paid to physical interpretation of outputs of the methods listed above.
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