|
|
Properties of faint meteors studied by video observations
Vojáček, Vlastimil ; Borovička, Jiří (advisor) ; Campbell-Brown, Margaret (referee) ; Tóth, Juraj (referee)
Parallel double-station video observations paired with spectroscopic video observations are a good way to study millimetre-sized meteoroids. Almost two decades of video observations of meteors at the Ondřejov observatory give us broad database to study large quantities of meteoroids and their properties. In this work we combined spectral video observations and results of the modelling of the fragmentation of meteoroids. Along with complex infor- mation about meteoroid's trajectories and orbits, this can give us better understanding about origin, internal structure etc. of these millimetre-sized interplanetary bodies. Meteoroids that contained small grains tend to release the sodium early. Since there is a smaller amount of sodium for Na depleted meteoroids, the sodium was released earlier than it was released for meteoroids with same grain sizes and without the sodium depletion. Overall, meteoroids with sodium depletion showed different composition: they were composed of stronger material without very small grains and they did not showed very bright wakes. Two iron meteoroids on Halley type orbits were observed. They are probably remnants of complicated early years of our solar system. The dis- tribution of grain sizes of Jupiter-family members was in a good agreements with results from the COSIMA...
|
|
|
Fragmentation of African Political Map: Contemporary Secessionist Movements
Vlasatá, Barbora ; Riegl, Martin (advisor) ; Doboš, Bohumil (referee)
The aim of bachelor's thesis Fragmentation of political map of Africa: current separatist movements is to show secessionist conflicts and movements in Africa that have been active after 2011. In the first part of the thesis there are the explanations of the main terms - separatism, secession, self-determination of nations, separatist and secessionist movements, armed non-state actors and conflicts. In the next part there is an overview of secessionist conflicts that have been active at during at least one year since 2011 and movements that have been part of these conflicts and are the secessionist type of armed non-state actors according to Eran Zohar calling for an independent state. This part also aims to find out if there has been a tendency to internationalization of these conflicts. The last part of thesis is composed of case studies of five african secessionist conflicts and movements - Kata Katanga in Democratic republic of Congo, National Movement for the Liberation of Azawad/Coordination of Movements of Azawad in Mali, Ogaden National Liberation Front and Oromo Liberation Front in Ethiopia and Sudanese People's Liberation Movement/Army-North in Sudan. There is aim to demonstrate the development of these conflicts and also the roots of the conflict, the particular movement and secessionist...
|
|
|
Historical and present anthropogenic gradients in landscape
Staněk, Ondřej ; Vojta, Jaroslav (advisor) ; Klinerová, Tereza (referee)
My bachelor thesis is concerned in determining and classification of main anthropogenic influences in various ecosystems. Intensity and direction of landscape transformations such as nutrient income, terrain changes, disturbance, biomass removal or fragmentation is discussed and evaluated. Other landscape factors taking part in ecosystem endurance like different structure and pH of soils or various microclimatic conditions are also taken in notice. It seems that intensity of human influence varies depending on it's nature and it is difficult to propose a linear scale of these changes. From this point of view German hemeroby concept is discussed as possibly suitable scale of human influence. Historical and present anthropogenic gradients in landscape - Abstract (EN) Ondřej Staněk, 2010
|
|
|
Study of derivatization reactions for ESI-MS analysis of hardly ionizable rhenium aryl chlorocomplexes
Vlk, Mikuláš ; Štícha, Martin (advisor) ; Kozlík, Petr (referee)
Mass spectrometry with electrospray ionization is an excellent method for structural analysis of coordination compounds with outstanding sensitivity and selectivity. However, it fails to detect some low-polar rhenium complexes. This master thesis describes derivatization method of non-ionizable rhenium complexes with 1,2-dihydroxybenzene and 2,3- dihydroxytoluenene. Fragmentation mechanisms and structure of prepared complexes was studied using high resolution mass spectrometry and collision-induced dissociation (CID). Furthermore, density functional theory (DFT) computational method was used for prediction of bond cleavage based on bond lengthening.
|
|
|
Study of derivatization reactions for ESI-MS analysis of hardly ionizable rhenium aryl chlorocomplexes
Vlk, Mikuláš ; Štícha, Martin (advisor) ; Kozlík, Petr (referee)
Mass spectrometry with electrospray ionization is an excellent method for structural analysis of coordination compounds with outstanding sensitivity and selectivity. However, it fails to detect some low-polar rhenium complexes. This master thesis describes derivatization method of non-ionizable rhenium complexes with 1,2-dihydroxybenzene and 2,3- dihydroxytoluenene. Fragmentation mechanisms and structure of prepared complexes was studied using high resolution mass spectrometry and collision-induced dissociation (CID). Furthermore, density functional theory (DFT) computational method was used for prediction of bond cleavage based on bond lengthening.
|
|
|
The importance of woodlots and their ecological characteristics for birds in an intensively managed agricultural landscape
Rajmonová, Lenka ; Reif, Jiří (advisor) ; Šálek, Martin (referee)
Various types of woody vegetation are a key biodiversity refugee in intensively managed agricultural landscapes. However, the role of woodlots, representing an important type of such a vegetation, remains overlooked so far. Whereas the previous studies focused on the effect of their area, shape and isolation, consequences of variation in their habitat quality for biodiversity were not assessed up to now. This thesis is thus one of the first studies focusing on woodlots as a specific habitat for birds in agricultural landscape. My goals were: (I) to find out what is the bird community composition of woodlots in a Czech landscape, (II) to find out, what are the key habitat predictors of bird species richness and abundance in woodlots, (III) to describe differences in habitat preferences among various guilds and (IV) to formulate recommendations for conservational practice. I surveyed birds in 82 woodlots in an intensively managed landscape in Central Bohemia, Czechia, and measured variables describing woodlots' habitat quality together with woodlots' area, shape, isolation and types of surrounding land-use. I recorded numerous forest and non-forest bird species (57 in total), including some endangered farmland birds. The habitat variables showing significant relationships to bird community...
|
|
| |
|
|
Launch of the public-service culture channel: Broadcast Analysis of ČT art untill the year 2014
Skalník, Jan ; Bednařík, Petr (advisor) ; Štoll, Martin (referee)
Diploma thesis "Launch of the public-service culture channel: Broadcast analysis of ČT art until the year 2014" describes the origin and development of the channel ČT art, including an analysis of how it influenced the transformation of ČT2. This thesis, therefore, includes the programme composition of both channels monitoring the period from autumn 2013 to autumn 2014, as well as the programme composition of ČT2 from autumn 2012. This allows us to evaluate how ČT2 attended to cultural broadcasting before the launch of the new and thematically specialized channel ČT art. Moreover, the thesis tries to point out the trends taking place in television broadcasting such as digitalization, fragmentation of TV audiences and media convergence. These trends are illustrated by using specific examples from the Czech Television, as well as the theoretical foundation. The theoretical part of the thesis focuses on describing public-service media, services they provide and their roles in fulfilling the cultural needs of society. In addition, it also draws attention to examples of culturally oriented channels within Europe. The results of the analysis of programme schemes of both channels are complemented by findings from interviews with the leading employees of the Czech Television, which were not aimed to focus...
|
|
|
Euroscepticism and Fragmentation in the British Conservative Party 2015-2017
Svobodová, Markéta ; Kasáková, Zuzana (advisor) ; Kłusek, Johana (referee)
The main goal of a bachelor thesis called Euroscepticism and Fragmentation in the British Conservative Party 2015-2017 is to analyse fragmentation in Conservative Party caused by different opinions on how to deal with the European question on four main events that occurred in those years. It also attempts to answer whether and how the party Euroscepticism has changed. The events used for the analysis are the general election in 2015, the referendum concerning the British membership in European Union in 2016, the intra party election in the same year and the general election in 2017. Thesis includes theoretical part, which covers several typologies concerning factions and Euroscepticism. Based on the theoretical part were laid out three research criteria. The first criterion examines the external manifestations of Euroscepticism on party manifestos on which are compared statements concerning the European Union. The next chapter criterion examines the internal manifestations of party Euroscepticism and fragmentation. They are analysed based on the behaviour of factions and politicians between 2015 and 2017. The last criterion maps the manifestations of Euroscepticism and fragmentation on the intra party election of a new party leader. Before each analysis comes a description of examined subjects....
|
|
|
Magnetic spin ice states in artificial magnetic frustrated systems
Schánilec, Vojtěch ; Hrabec, Aleš (referee) ; Rougemaille, Nicolas (advisor)
Uměle vytvořené systémy spinového ledu jsou vhodným nástrojem pro zkoumání neobvyklých jevů, které se v přírodě dají jen těžko pozorovat. Speciálním případem umělého spinového ledu je kagome mřížka, která umožňuje zkoumat kolektivní chování spinů v látce. Tento systém má řadu předpovězených exotických magnetických fází, které zatím nebyly změřeny a prozkoumány v reálném prostoru. V rámci této práce se zabýváme úpravou kagome mřížky tak, aby mohla být využita ke zkoumání exotických stavů v reálném prostoru. Experimenty provedené na naší upravené mřížce ukazují, že jsme schopni detekovat nízko i vysoko energiové stavy, a tedy, že námi navržená úprava kagome mřížky je vhodná pro zkoumání exotických stavů v reálném prostoru.
|
guest ::
