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An overview of explosive volcanism on Venus
Baranová, Anna ; Brož, Petr (advisor) ; Tomek, Filip (referee)
An Overview of Explosive Volcanism on Venus - Abstract In this thesis, I aim to provide an overview of explosive volcanism on Venus. The existence of explosive volcanism on Venus is uncertain. Despite unfavorable conditions of high atmospheric density and pressure that hinder explosive volcanic activity, as well as a planetary interior thought to be poor in volatiles that would enable fragmentation, evidence of in the form of putative surface expressions of explosive volcanism on Venus has been proposed - a putative pyroclastic flow deposit, Scathach Fluctus, and a series of locations of radar bright material, interpreted as the deposits of explosive volcanic activity. Numerical modeling of fragmentation and volcanic plume rise has shown that explosive volcanism would only be possible under very specific conditions of vent geometry and location, and magma volatile contents. While H₂O is likely acts as the main volatile on Venus, CO₂ and SO₂ are likely represented in higher percentages in the volatile fraction than on Earth, and hence can lower the required amounts of H₂O to values reasonable under Venusian conditions. If explosive volcanism does occur, it is constrained by the high pressure on the Venusian surface and is believed to exist in the form of pyroclastic density currents, rather than...
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Chemistry of Venus and EnVision mission
Kubíčková, Tereza ; Ferus, Martin (advisor) ; Kabáth, Petr (referee)
In this thesis, we summarize basic knowledge regarding chemical processes occuring in Venus atmosphere with an accent on its theoretical modelling and related spectral research. We briefly summarize objectives and technical details about scheduled ESA EnVission mission, which is supposed to widen current knowledge concerning the history, present and future of the planet and its climate, morphology, geophysics and chemical environment. The outcome of this thesis is a summary of spectral measurements of selec- ted atmospheric species using laboratory technique known as High Resolution Infrared Spectroscopy with Fourier Transform (HR-FTIR), recorded in NIR spectra of Venus with a special focus on a range of echelet spectrometer of the EnVision probe. Further in the thesis we describe a related computational atmospheric model ARGO, whose results con- cerning selected compounds are compared to in situ measurements and results of other atmospheric models. The aim of this thesis is to outline a current state of Venus research and its future related to the plan of EnVision mission and to verify functionality of current cumputational atmospheric model. 1
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Mythological Inspiration in the poetry of Lorenzo de' Medici
Lukášová, Denisa ; Pelán, Jiří (advisor) ; Žáčková, Magdalena (referee)
The first part of this master thesis is focused on the personality of Lorenzo deʼ Medici and his inclusion in the period and cultural contexts. The literary background of Italy in the 15th century is introduced, as well as the Lorenzo's life, the summary of his literary output and his contribution as a patron of the Florentine culture and arts. The second part analyzes four of the Lorenzoʼs works related to mythological themes going back until the ancient writers. Lorenzoʼs evident influence by these authors is illustrated with the specific quotations but at the same time his own innovations in texts and stories are referred to. The conclusion compares an extend of this influence on him and the contribution of his own invention to the particular works. It points out the uniqueness of the personality of Lorenzo deʼ Medici both in the cultural and literary spheres as well.
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Phosphine and nitrous oxide as false-positive biosignature gases in planetary spectra
Kaiserová, Tereza ; Ferus, Martin (advisor) ; Kopecký, Vladimír (referee)
5 Abstract This study is dedicated to evaluating the potential for a novel pathway of abiotic synthesis of phosphine (PH3) from phosphorus trioxide (P4O6) by a photocatalytic mechanism on aerosols. The mechanism might explain the recent possible detection of phosphine on Venus. This scenario has recently been suggested theoretically by our team based on an analogy with methane production form carbon dioxide on acidic photochemically-active surfaces of materials, which may account for a possible source of methane on Mars. Methane, just like phosphine, was suggested as an indicator of life on terrestrial planets, including Mars. The theoretical testing of photochemical phosphine generation suggests that even if this gas is present in the atmosphere of Venus it cannot be considered as an indicator of life until the suggested mechanism is excluded theoretically, or by experimental results, or direct evidence of life on Venus. This thesis will be followed by preparation of sophisticated experiments and intensive laboratory research addressing this. Furthermore, the role of nitrous oxide as another false positive biosignature was evaluated in this study. The presence of nitrous oxide can also be explained by processes other than biological, particularly on early planets. This study specifically demonstrates the...
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Image of Venus in Renaissance Art under the Influence of Ancient Art
Hloušková, Markéta ; Jarošová, Markéta (advisor) ; Zlatohlávek, Martin (referee)
The bachelor thesis focuses on the various representations of the mythological Goddess Venus in the Italian Renaissance art. In the introduction of the work, the ancient art and its influence on the Renaissance art will be analyzed. Further, the importance of Greek and Roman mythology and the origin of the myth of the Goddess Venus would be explained. The key point of the work is the masterpiece by Sandro Botticelli - "The Birth of Venus", which will be analyzed from historical and formal perspective. The aim of this thesis is to map out Renaissance artworks in which this subject is reflected. Keywords Ancient art, Italy, Mythology, Neoplatonism, Renaissance, Renaissance art, Sandro Botticelli, Venus, The Birth of Venus, The ideal of Woman
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Mythological Inspiration in the poetry of Lorenzo de' Medici
Lukášová, Denisa ; Pelán, Jiří (advisor) ; Žáčková, Magdalena (referee)
The first part of this master thesis is focused on the personality of Lorenzo deʼ Medici and his inclusion in the period and cultural contexts. The literary background of Italy in the 15th century is introduced, as well as the Lorenzo's life, the summary of his literary output and his contribution as a patron of the Florentine culture and arts. The second part analyzes four of the Lorenzoʼs works related to mythological themes going back until the ancient writers. Lorenzoʼs evident influence by these authors is illustrated with the specific quotations but at the same time his own innovations in texts and stories are referred to. The conclusion compares an extend of this influence on him and the contribution of his own invention to the particular works. It points out the uniqueness of the personality of Lorenzo deʼ Medici both in the cultural and literary spheres as well.
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