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Design of highway bridge formed by beam girder
Řezníček, Martin ; Čihák, Petr (referee) ; Nečas, Radim (advisor)
The aim of diploma thesis is to design a made-up bridge construction over the road network.There were made three studies of bridging which were compared consequently. Two-joint ginder without haunched was selected as the most suitable option and it was designed in details. The construction was assessed according to the ultimate and serviceability limit state.
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Bridge over a local road and a brook
Tichavská, Andrea ; Čihák, Petr (referee) ; Nečas, Radim (advisor)
The purpose of the master thesis is the design of the concrete highway bridge by European standards. The highway is situated on two independent prestressed load-bearing structures with cross-section area of constant dimensions over its length. The bridge deck is built on a falsework considering its proportions and obstacles under the bridge. The thesis contains the design and the assessment of the load-bearing structure in longitudinal and transverse direction including the calculation of cross beams and an anchorage zone.
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Design of the road bridge in Brno
Kutálek, Jiří ; Čihák, Petr (referee) ; Klusáček, Ladislav (advisor)
The subject of the diploma thesis is a design of a highway bridge across the Svratka river in Brno. Among three options, the arch bridge with a trapezoidal bridge deck from prestressed concrete was chosen. The load effect is calculated with the assistance of Scia Engineer software. The design and the assessment of the structure are made for the ultimate limit state and serviceability limit state. Static assessment is done by hand calculation according to CSN EN 1992-2. The thesis includes drawings and visualizations of the bridge structure.
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Microhabitat preferences for overwintering water bugs
ČIHÁK, Petr
This diploma thesis deals with overwintering of water bugs. The goal of the thesis is to experimentally find out what microhabitats do these water bugs prefer for overwintering. The experiment took place in the greenhouse in the educational garden of PF JU in České Budějovice (48° 58'32.182 "N, 14° 26'54.218" E) from the beginning of November 2017 to the beginning of March 2018. Terrestrial and water microhabitats were created in the greenhouse. They served as a place for potential overwintering of the water bugs. Defined numbers of individuals of given species were put into the center of the greenhouse in boxes with small amount of water. The source of the water bugs were surrounding ponds and a pool in the educational garden. At the end of the experiment, all microhabitats and their surroundings were closely looked through. The found individuals (both alive and dead) were counted and put into sample containers filled with concentrated alcohol. The results are following. Notonectidae prefer mainly water microhabitats, mainly when there are rotting leaves. Corixidae do not prefer any of these microhabitats and presumably they escaped through the little holes in the greenhouse. Nepidae stayed in the original box throughout the experiment. The Ranatra linearis died, whereas Nepa cinerea survived until frosts that caused complete freezing for several following days.
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Design of the road bridge in Brno
Kutálek, Jiří ; Čihák, Petr (referee) ; Klusáček, Ladislav (advisor)
The subject of the diploma thesis is a design of a highway bridge across the Svratka river in Brno. Among three options, the arch bridge with a trapezoidal bridge deck from prestressed concrete was chosen. The load effect is calculated with the assistance of Scia Engineer software. The design and the assessment of the structure are made for the ultimate limit state and serviceability limit state. Static assessment is done by hand calculation according to CSN EN 1992-2. The thesis includes drawings and visualizations of the bridge structure.
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An influence of water turbidity on the effectivity of water insects capture rate by subaquatic light traps
ČIHÁK, Petr
The goal of this bachelor thesis is to determine the influence of water turbidity on the effectivity of water insects capture rate by subaquatic light traps. The experiments were carried out at the educational garden of Faculty of Education of the University of South Bohemia (48° 58'32.182 "N, 14° 26'54.218" E) during two years. Four tanks were placed on the garden, each holding 400 l of water. A different amount of clay was dispersed in the tanks and a defined amount of specimens of the stated species were added. The water insects were firstly captured in the nearby ponds and a pool at the educational garden. Then, light traps with different entrance size according to the size of the selected species were used for the capture. The light traps were thrown into the tanks in early evening hours and collected in the early morning. In the morning, all the specimens both in and out of the traps were fixed in concentrated ethanol. The samples were then counted and the species were determined using laboratory equipment. The species of water insects were then statistically evaluated. The experiments resulted in findings that the subaquatic light traps are valuable technique for aquatic insects sampling. The traps were highly effective in the capture of aquatic bugs (water boatmen and backswimmers) and low effective for dipterans (Chaoborus) in both clear and turbid waters. The turbidity does not affect capture rate of selected species of aquatic insects, at least in small water bodies.
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Design of highway bridge formed by beam girder
Řezníček, Martin ; Čihák, Petr (referee) ; Nečas, Radim (advisor)
The aim of diploma thesis is to design a made-up bridge construction over the road network.There were made three studies of bridging which were compared consequently. Two-joint ginder without haunched was selected as the most suitable option and it was designed in details. The construction was assessed according to the ultimate and serviceability limit state.
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Bridge over a local road and a brook
Tichavská, Andrea ; Čihák, Petr (referee) ; Nečas, Radim (advisor)
The purpose of the master thesis is the design of the concrete highway bridge by European standards. The highway is situated on two independent prestressed load-bearing structures with cross-section area of constant dimensions over its length. The bridge deck is built on a falsework considering its proportions and obstacles under the bridge. The thesis contains the design and the assessment of the load-bearing structure in longitudinal and transverse direction including the calculation of cross beams and an anchorage zone.
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Hedge Funds and Their Impact on Financial Markets
Jeřábek, Tomáš ; Musílek, Petr (advisor) ; Daňhel, Jaroslav (referee) ; Čihák, Petr (referee)
The aim of this PhD thesis is to analyze the history and current situation of hedge funds and assess their potential to destabilize financial markets. The findings of the analysis are used to validate the assumptions underlying the major regulatory changes of hedge funds in the key global economic centres after the financial crisis in 2008 and 2009. Since their inception early last century hedge funds have gone through a period of great expansion in the sixties, followed by a decline due to large losses sustained in the early seventies. The nineties meant a real breakthrough for hedge funds as a result of which they became prominent players in the alternative investment space. As of today, there is over ten thousand hedge funds that globally manage close to 3 trillion US dollars. Compared to mutual funds and other financial institutions the volume of assets under management is still relatively small, the rate of growth over the past fifteen years has however been very significant. What is emphasized with respect to the impact of hedge funds on financial markets is the contribution to increasing the liquidity and efficiency and their role on the financial derivatives market where hedge funds are actively involved in the transfer of risk. They are at the same time subject of criticism for their purported destabilizing effect on financial markets and contribution to fluctuations in the prices of investment instruments. Although the share of hedge funds in triggering major financial crises has not been conclusively established, these investment entities were one of the targets of the wide-ranging regulatory changes following the financial crisis of 2008 and 2009. The dissertation first discusses the history and current situation of hedge funds and defines the term hedge fund. The following section describes the basic characteristics and principles of their functioning and reviews the regulation in the major domiciles. The final chapter is focused on the empirical analysis of the impact of hedge funds on financial markets. The inputs for this analysis include a global hedge fund index and representative market indices and data from the CFTC on positions in the 10 year US government treasury note futures. In the first step the descriptive statistics for the transformed time series are presented. The second part of the analysis focuses on lagged correlations between returns and volatility of the global hedge fund index and representative market indices. Granger causality tests are applied in the following section to determine the relationships between the returns and volatility of hedge fund and representative market indices. In the final step of the analysis Granger causality tests are used to analyze the link between the changes in positions in the 10-year US treasury note futures held by hedge funds and the change in settlement prices of these futures with the aim to assess whether hedge funds have the capacity to move the market. In conclusion, the results of this analysis are discussed in light of the recent regulatory changes and the potential for the future growth of hedge funds is assessed.
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