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Laboratory task - Polarization-based quantum key distribution
Poláková, Sylva ; Münster, Petr (referee) ; Klíčník, Ondřej (advisor)
This bachelor thesis focuses on a detailed analysis of quantum key distribution (QKD) with a focus on one-way prepare-and-measure protocols with discrete variable (DV-QKD) and polarization coding. The thesis is divided into a theoretical and practical part. The introductory theoretical part of the thesis provides a comprehensive overview of polarization as a fundamental physical phenomenon that is essential for understanding the operation of QKD protocols. Various aspects of polarization are discussed, including Jones vectors, Stokes parameters, and the Poincaré sphere. The next section covers the basics of quantum mechanics with a focus on qubit and the representation of quantum states. The work then moves on to quantum key distribution itself, where the basic principles of QKD are explained, and the most important protocols are also analysed. In the practical part, a laboratory task is designed to demonstrate the importance of polarization in the context of QKD protocols.
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Preparation of perovskite solar cells with regular n-i-p architecture and their optimization
Poláková, Simona ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The diploma thesis deals with the study of perovskite solar cells with a regular n-i-p architecture. The theoretical part of this work is mainly focused on the stability of perovskite solar cells, i.e. thermal stability and the influence of UV radiation on final perovskite solar cell stability. Furthermore, the deposition methods, the architecture of solar cells and the materials used for the preparation of electron and hole transport layers were described in more detail. The experimental part deals with the optimization of the preparation of perovskite solar cells (especially in terms of resulting photovoltaic conversion efficiency), with a description of the structure preparation process of the final photovoltaic cell and the interpretation of the measured results.
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Perovskite solar cells
Poláková, Simona ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The bachelor´s thesis deals with the study of perovskite solar cells. The theoretical part of this work is devoted to the stability of the perovskite layer and perovskite solar cells, especially chemical and thermal stability are discussed. Furthermore, deposition methods of perovskite active layer were described in more detail. The experimental part deals with the influence of the dropping of the diethyl ether solution during the deposition of the active layer (at different time intervals) on the final efficiency of solar energy conversion, with the preparation of the final perovskite solar cells and with the characterization of the basic electrical properties of the prepared structures.
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New interconnections between lipid metabolism and chromatin regulation
Princová, Jarmila ; Převorovský, Martin (advisor) ; Bágeľová Poláková, Silvia (referee) ; Malínský, Jan (referee)
Lipid metabolism has been implicated in changes of chromatin modifications resulting in altered gene expression. Such regulation is important for cellular differentiation or cancer progression, however, the mechanism of how altered metabolic flux leads to targeted changes in chromatin modifications which then regulate gene transcription or heterochromatin maintenance is still poorly understood. We describe that fission yeast cells defective in fatty acid synthesis show increased expression of a subset of stress-response genes. This altered gene expression depends on the SAGA and NuA4 histone acetyltransferases and is associated with increased acetylation of histone H3 at lysine 9 in the corresponding gene promoters. Moreover, diminished fatty acid synthesis results in increased cellular resistance to oxidative stress. Additionally, the lipid metabolism mutants display chromatin alterations in centromeres and subtelomeres, regions of constitutive heterochromatin. We propose that changes in lipid metabolism can regulate histone acetylation and transcription of specific stress-response genes, but also lead to more global changes in heterochromatin. And while we clearly see the consequences of increased stress-response genes which result in promoting redox homeostasis, the implications of altered...
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The changes of imagination-portrait of the city by using digital technologies in the context of analog media
Poláková, Sylva ; Hanáková, Petra (advisor) ; Dolanová, Lenka (referee)
1 Filosofická fakulta UK v Praze Katedra filmových studií Proměny imaginace-portrétu města vlivem digitálních technologií v kontextu analogových médií Vedoucí diplomové práce Autorka práce PhD. Petra Hanáková Sylva Poláková Praha 2006 2 Prohlášení: Prohlašuji, že jsem diplomovou práci vypracovala samostatně a uvedla jsem v ní všechny použité prameny a literaturu. V Praze dne 27. srpna 2006. Sylva Poláková Rooseveltova 47 Praha 6 3 Poděkování: Na tomto místě bych chtěla poděkovat své vedoucí diplomové práce PhD. Petře Hanákové za její kritické poznámky i trpělivý přístup. 4 OBSAH 006 Úvod 013 Městský film nebo portrét velkoměsta? 018 Flâneur 018 Kdo je tedy flâneur? 027 Flâneurské zkušenosti mění způsob dívání se 031 Zrození flâneura ve filmovém příkladu: Alexander Hackenschmied, Bezúčelná procházka 033 Flâneuse 033 Neexistující flâneuse 038 Pátrání po flâneuse a její přínos flânerii 041 Vnímání velkoměst v raném filmu: fobie a modernistické utopie 041 Městské fobie v narativním filmu dvacátých let - uliční filmy a kammerspiel 046 Nadšení prvních městských filmů: Walter Ruttmann, Berlín, symfonie velkoměsta 051 Dziga Vertov, Muž s kinoaparátem 055 Osvětlení - prodloužení flâneurova dne a ohrožení jeho svobody: Svatopluk Innemann, Praha v záři světel 060 Urbanistické vize v didakticko-osvětových a...
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The effect of urbanization on life-history strategies in birds
Houšková, Karolína ; Sedláček, Ondřej (advisor) ; Poláková, Simona (referee)
Urbanisation process is recently a wide-spread process that causes high-impact environmental transformation. Habitats affected by urbanization tend to change substantially and ongoing changes influence organisms living in this environment. Urban environment modifies many abiotic conditions (e.g. temperature, artificial light and noise) and biotic factors (e.g. food supply, parasite prevalence, predation pressure) in comparison to natural habitats. In this manner, especially urban bird populations have recently gained broad attention by an increasing number of ecologists. Urban avoiders - typically sensitive and specialized bird species often vanish from urbanized landscapes. However, many bird species were able to colonize urban environment and coexist successfully with man. Populations of birds living in such a new type of environment show many characteristics different from populations living in original habitats. The objective of this work is to review current studies about changes of life strategies in urban bird populations such as modifications of acoustic signals, differences in reproductive and food ecology and physiological or behavioural responses.
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Preparation of perovskite solar cells with regular n-i-p architecture and their optimization
Poláková, Simona ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The diploma thesis deals with the study of perovskite solar cells with a regular n-i-p architecture. The theoretical part of this work is mainly focused on the stability of perovskite solar cells, i.e. thermal stability and the influence of UV radiation on final perovskite solar cell stability. Furthermore, the deposition methods, the architecture of solar cells and the materials used for the preparation of electron and hole transport layers were described in more detail. The experimental part deals with the optimization of the preparation of perovskite solar cells (especially in terms of resulting photovoltaic conversion efficiency), with a description of the structure preparation process of the final photovoltaic cell and the interpretation of the measured results.
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Perovskite solar cells
Poláková, Simona ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The bachelor´s thesis deals with the study of perovskite solar cells. The theoretical part of this work is devoted to the stability of the perovskite layer and perovskite solar cells, especially chemical and thermal stability are discussed. Furthermore, deposition methods of perovskite active layer were described in more detail. The experimental part deals with the influence of the dropping of the diethyl ether solution during the deposition of the active layer (at different time intervals) on the final efficiency of solar energy conversion, with the preparation of the final perovskite solar cells and with the characterization of the basic electrical properties of the prepared structures.
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The convergence of film and architecture. The case of Prague
Poláková, Sylva ; Hanáková, Petra (advisor) ; Petříček, Miroslav (referee) ; Pospiszyl, Tomáš (referee)
This dissertation examines the as yet untethered practice of the convergence of film and architecture in public municipal spaces against the backdrop of the idea of the relocation of the moving picture. Since this is an interdisciplinary practice whose forms and operations are influenced by a host of dynamics, the initial film perspective is supplemented by related themes from the spheres of architecture, public municipal space, and the organisation of culture and the applied arts, including advertising. The wide range of subjects covered in this dissertation is given focus by narrowly localised research examining the situation in Prague from the 1990s until 2010. Along with the case study, the chapters devoted to the discursive field form a progress report on the situation as regards this particular media practice, the outputs of which are subject to a short half-life that considerably limits the possibility of archiving them. The structure of the case study is derived from a specific classificatory framework and is close to the "catalogue" format, determined by a series of questions - who participated on the convergence of film and architecture and where, when and how. Though a specific segment of time was monitored, it did not remain free of links to previous working methods, historical situations and...
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Caring for patients colonized with resistant microbial strains
Poláková, Stanislava ; Heczková, Jana (advisor) ; Novotná, Jindra (referee)
This thesis is focused on the complex nursing care of patients colonized with the resistant microbial strains. In the theoretical section I describe the major events of the history, the current issue of the antibiotic treatment and the species of occurring resistant strains of microbes. It also deals with recommended procedures in the care for these patients, such as patient isolation, use of the protective equipment, handling of the biological material , individualization of the aids, handling of the linen and the principles of health care. It also includes preventing the spread of disease resistant strains of the microorganisms and patient recolonization. The empirical part consists of the quantitative research conducted at the University Hospital in Pilsen with the help of a questionnaire survey. The questionnaires will be distributed to the nurses in intensive care units without the single - patient box system. The aim of the research is to determine nurses' knowledge of the disease resistant microbial strains and the ways they create patient isolation. Evaluation questionnaires will provide the pieces of information to compare the individual practices and knowledge of nurses in intensive care units. Results of this work can be used as a source of information or the study material. The benefit...
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