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Determination of the most suitable ratio of cathode materials for the lithium-sulfur battery system
Benešová, Petra ; Kazda, Tomáš (referee) ; Jaššo, Kamil (advisor)
This master's thesis deals with a topic of determination of the most suitable ratio of cathode materials for the lithium-sulfur systems. The first two chapters provide a general introduction to the topic of electrochemical energy sources and present the commonly used primary and secondary battery systems with emphasis on their characteristics and applications. The core of the theoretical part is dedicated to lithium-ion and lithium-sulfur batteries, their working principles along with the benefits or drawbacks related to the particular systems, and widely used materials. The experimental part briefly comments on determining the suitable electrode paste preparation method, the subsequent main part is focused on evaluation of electrochemical performance of cells using different ratios of cathode materials. Five samples of cathode materials were prepared, where the sulfur ratio is in range from 64 to 88 wt. %. Finally, the comparison of all prepared ratios in terms of their electrochemical properties is provided.
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Electrode materials and electrolytes for aluminium-ion accumulators
Benešová, Petra ; Kazda, Tomáš (referee) ; Čech, Ondřej (advisor)
This bachelor thesis presents a topic of aluminum-ion batteries, which have recently attracted great attention owing to their good electrochemical performance and possible use in commercially produced electronics. The paper introduces the basic principles of the function of aluminum-ion accumulators and their advantages, which are a main motivation for further research. The main feature of the theoretical part is an overview of the current state of research on suitable electrode materials and electrolytes for this type of accumulators. The experimental part is focused on the preparation of several carbon-based cathode materials, preparation of the IL-type electrolyte and subsequent cell assembly. The obtained results are evaluated and briefly discussed, taking into account the effects of the cell components and other factors.
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NURSING CARE OF CANCER PATIENTS WITH HAEMATOPOIESIS DISORDER IN CONNECTION WITH ANTITUMOR CHEMOTHERAPY
BENEŠOVÁ, Petra
Abstract The aim of this thesis was to find the specifics of nursing care of cancer patients with haematopoiesis disorder in connection with antitumor chemotherapy and to map out the compliance with the specific measures for haematopoiesis disorder as a result of chemotherapy. We also focused on complications which emerged with administering chemotherapy, patient education about regime measures and on patient evaluation of the nurses' nursing care and their cooperation. Methodology and research file: to meet the target, a qualitative research was used in the form of semi-structured interview with the nurses and patients. The results of the interviews were analysed with the help of open coding with the pencil-paper method and subsequently divided into categories with subcategories. For nurses 3 categories with 4 subcategories were created and for patients 5 categories with 2 subcategories. The first research file consisted of twelve nurses working in oncology departments of five hospitals in the Czech Republic. The second research unit consisted of seven patients chosen with deliberate selection method. The results: It was found that the nurse in the care of cancer patients with haematopoiesis disorder works as a provider of barrier nursing care. The nurse takes the role of an educator during the application of chemotherapy and during the discharge of the patient into home healthcare, when she informs the patient about the need to comply with the specific measures which are diet regime, limited contact only to immediate family, the unsuitability of visiting restaurants, specific habits and using respiratory protection. All of the patients agreed that they try to follow the recommended regime measures. Simultaneously, they evaluated the measures as limiting both in work and personal life. The results for practice: The result of this research can be a theme for creating a information brochure for cancer patients or a topic for an educational seminar for nurses discussing this issue.
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Czech press for people called up to forced labour in Nazi
Benešová, Petra ; Köpplová, Barbara (advisor) ; Gebhart, Jiří (referee)
The diploma thesis Czech Press for People Called up to Do Forced Labour in Nazi Germany deals with the weekly Czech Labourer which was sent to the Czech workers called up to German factories during the period of the Protectorate of Bohemia and Moravia within the years 1939-1945. The thesis aims at exploring its origin, publishing and changes concerning its publishers and owners. It also analyses its distribution to Nazi Germany and its content in detail. Furthermore, by means of the quantitative analysis the thesis surveys the thematic agenda of the main articles on the front pages. It discusses the impact of the propagandistic information in media on those who were called up to do forced labour. Within the context, this paper examines the operation of media during the period of Protectorate of Bohemia and Moravia.
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Collateralized Debt Obligation: Valuation and Sensitivity Analysis
Benešová, Petra ; Teplý, Petr (advisor) ; Dědek, Oldřich (referee)
A collateralized debt obligation (CDO) is a highly leverage structured credit product linked to credit events of a pool of underlying debt securities. CDO can be understood as an insurance against a credit risk of the pool where its issuer is a protection buyer and its investor is a protection seller. Whereas a CDO issuance has boomed in recent years, by the end of 2008 two thirds of CDOs were in a formal state of default. The aim of this thesis is to clear up the course of events which lead to the suspension of the CDO market and to deduce recommendations for its future development. To do so we develop a valuation program in MS Excel VBA based on a One Factor Gaussian Copula model. Using the program we first apply a sensitivity analysis, than we model value of a CDO tranche before the financial crisis stroke and after it to value a loss of investors based on a change in expected cash- flows. We detect four main deficiencies. First, the market was not properly diversified. Second, the valuation model was often not deeply understood which led to a mispricing of CDO tranches. Third, this resulted in a mispriced base correlation. We also numerically demonstrate the fourth deficiency, i.e. the mark-to-market valuation obligation which can have destructive effects. Recommendations to remove these...
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název v anglickém jazyce není uveden
Benešová, Petra ; Langmeier, Miloš (advisor) ; Hach, Petr (referee) ; Kozler, Petr (referee)
Using hislochemical analysis (NADPH-diaphorase) we have been investigating the influence of intraperitoneal administration of kainic acid, hypoxia and combination of both these factors on neurons of the hippocampus and on the primary auditory cortex in male rats of the Wistar strain. Kainic acid was administered to 12-day-old and I8-day-old animals, which were exposed to long-lasting repeated hypoxia from the 2nd till the 17th day of age in a hypobaric chamber (for 8 hours a day). At the age of 22, 90 and 365 days, the animals were transcardially perfused with 4% paraformaldehyde under deep thiopental anesthesia. Cryostate sections were stained to identify NADPH-d positive neurons that were then quantified in CA1 and CA3 areas of the hippocampus, in the hilus, dorsal and ventral blade of the dentate gyrus and in the primary auditory cortex. In 22-day-old animals with kainic acid administered 18th day of life both hypoxia and kainic acid increased the number of NADPH-d positive neurons in the hilus, CA1 and CA3 areas of the hippocampus and in the primary auditory cortex. On the contrary, kainic acid given to the hypoxic animals lowered the number of NADPH-d positive neurons in the dentate gyrus. In 90-day-old animals with kainic acid administered 18th day of life hypoxia and kainic acid given to both,...
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Determination Of The Most Suitable Ratio Of Cathode Materials For The Lithium-Sulfur Battery System
Benešová, Petra
This paper presents the topic of lithium-sulfur batteries with a main focus on the influenceof different ratio of the cathode materials on the final electrochemical performance of the cell.The theoretical part of the article provides a comprehensive overview of the Li-S technology, mainadvantages and challenges related to the practical use of Li-S systems, and briefly mentions thetypical cathode materials. The objective of the experimental part is to provide a comparison of differentratios of cathode materials in terms of their electrochemical performance, taking into considerationthe physicochemical properties of prepared materials.
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