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Thermodynamic modelling of hydrogen fuel cells
Nováček, Marek ; Pavelka, Michal (advisor) ; Němec, Tomáš (referee)
In this thesis, proton exchange membrane fuel cells are studied. At the beginning, the ideas underlying their function are exposed and some possibilities of usage are pre- sented. Thereafter, we aim to describe the processes inside the fuel cells with the aid of thermodynamics and in agreement with constitutive relations that have been obtained experimentally. Namely, we are interested in the fluxes of water and protons inside the membrane, where they are acted upon by thermodynamic forces, and the electrochemical reactions at the electrodes, which can be described by the Butler-Volmer equations. Also do we study the efficiency of the fuel cell by evaluating the production of entropy due to the diverse processes that take place in the fuel cell. It is the goal of the computational part of this thesis to propose a zero-dimensional model and compare it with the results provided in the supervisor's doctoral thesis. 1
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The Comparison of the U.S. Security Policy Measures in Relation to the DPRK's Nuclear Program Adopted by the Administrations of Presidents George W. Bush and Barack Obama
Vítková, Kateřina ; Sehnálková, Jana (advisor) ; Anděl, Petr (referee)
The Comparison of the U.S. Security Policy Measures in Relation to the DPRK's Nuclear Program Adopted by the Administrations of Presidents George W. Bush and Barack Obama monitors the responses of Presidents George W. Bush and Barack Obama and their Administrations to the North Korean nuclear tests carried out in 2006, 2009 and 2013. It seeks to identify similarities and differences between these Administrations and prove the thesis that the steps taken by the United States under Barack Obama were in effect just as inefficient as those taken by his predecessor. The paper concentrates on the time period beginning with the situation before the first North Korea's nuclear test until the autumn 2014. The methodology includes a qualitative approach and comparison. The reactions are divided into several groups: rhetoric, strategic documents, legislation, economic aspects etc. In conclusion it notes that while the attitude of both Presidents and their Administrations was in certain aspects similar, number of factors that distinguish them might be indentified as well. Barack Obama focused more on the region of Asia. His attitude towards the DPRK appeared to be more balanced but it still did not lead to the coveted breakthrough in the negotiations.
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Audience perception to the paradoxical narrative in the series Game of Thrones
Částová, Barbora ; Reifová, Irena (advisor) ; Hladík, Radim (referee) ; Bednařík, Petr (referee)
The thesis "Audience reception to the paradoxical narrative in the series Game of Thrones" focuses on the research of the audience and its reactions to the unusual plot twists in the series Game of Thrones producted by HBO. The Audience and its reactions to specifically selected twists were researched through qualitative methods of deep semi-structured interview which was carried out with ten respondents. "Primary" audience, i.e. the viewers who had not read any books from the Ice and Fire saga before watching the show, was choosen as a research sample for this study. Reactions of this audience are more spontaneous and unpredictable. The primary aim of the research is to find out how viewers react to the newly defined paradoxical narrative in the Game of Thrones series and why they keep watching this series despite its unusual plot twists.
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Brand engagement on social media: Case study of intercultural raction comparison to commercial media content of Purina brands
Kubínová, Monika ; Zezulková, Markéta (advisor) ; Lütke Notarp, Ulrike (referee)
The aim of this thesis is to understand how the same marketing media content affects audiences of different cultures. Many global brands are managed centrally with unified marketing communication shared across the nations. Content relevance is tested abroad and may not be relevant to all countries where the communication is published. McQuail in his book Introduction to Mass Communication, mentions that different cultures accept the same media content with different effects. I will use a case study for the analysis of intercultural communication of centrally managed brands that will examine the difference in responses of Facebook users to centrally created marketing communication of the Felix and ProPlan brands that belong under the umbrella brand Purina. I divided the case study into two parts, the first part will be devoted to the content analysis of documents, statistics and already existing research from which I formulated research questions. The second part is a semiotic analysis of comments of the Facebook users to the Purina brands that is answering the research questions. The data from the comments shows that the reactivity within the two countries studied differed significantly and depended on the cultural differences defined by Hofstede's cultural comparison. Based on this case study, it...
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Behavioral symptoms in sexually abused children, families access and response of social workers
Abrahámová, Simona ; Kaňák, Jan (advisor) ; Stretti, Sylvie (referee)
Diploma thesis "Behavioral symptoms in sexually abused children, families access and response of social workers" focuses on clarifying the issue of child sexual abuse and its course. The introductory chapters deal with explaining the concept of sexual abuse and the possible occurrence. It characterized by potential victims, offenders and the possible risks. The work focuses on social and psychosomatic manifestations of children who are victims of sexual abuse. It compares the responses of children by age and sex. The important part is the revelation of the incident. Revealed is the most deliverance victim of pathological behavior. The work describes the victim may have reasons for concealing situation, how it reacts family after disclosure. How the assistence of social workers in contact with victims of sexual abuse.But also what measures are needed to prevent further deprivation of the child. The main goal of this work is to answer the main research question "What is the situation of the family associated with reportinag CSA?". This question seeks the whole structure of the work. The result of this thesis is the research part. The research is the analysis of documentation. The obtained dat to analyze the situation of families after reporting sexual abuse. The final summary contains the output of...
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Presence of Colonial Past in Contemporary Portugal
Tošnerová, Barbora ; Rovná, Lenka (advisor) ; Klíma, Jan (referee)
This diploma thesis, titled "Presence of Colonial Past in Contemporary Portugal", deals with how the Portuguese society has coped with their loss of the last colonies after the democratic revolution in the year 1974. Portugal belonged, along with Spain, to the first colonial powers in Europe and for long time - till the 20th century - the independence of colonies was for many Portuguese people unimaginable. Therefore a lot of them were surprised with the speedy decolonization of these territories after 1974. Investigation of reactions of Portuguese society to this change is based on the analysys of responses of its political and academic communities after the year 1976. Attitudes held by the wider society was demonstrated by the massive support of Portuguese to the former colony of East Timor during Semptember 1999. The approach of politicans is analysed in this work through their speeches during the key' historical moments, which influenced relations between Portugal and its former colonies during the years 1976-1996, as well as through government' programmes and comments in mass media. Analysis of academical discussion is concentrated mainly on the 1990s and present, when the colonial past has became a topic of great interest to many portuguese perits. A new field of academic interest, reffered...
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Level
Mrňová, Petra ; Prokop, Tomáš (referee) ; Ambrůz, Jan (advisor)
In her work, the student focuses on the objectification of personal perception of a specific conflict situation. She identifies a hurtful feeling that has stuck in her memory and constantly raises questions. With ignorance or unconsciousness of where the edge is and where it is beyond the edge. Describes and seeks mantineles of self-insight capacity. Where does the ability to control begin and end? The author tries to empathize with people who cross her imaginary edges in what is right, and asks herself if they cross their own? The performative placement of tempered glass in the crown of a tree serves for a materialistic grasp of the limits: "what can be carried", "where is the edge", "what is capacity."
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The preparation and study of catalytic system Cu(O)-CeO2 using surface analytical methods
Šmíd, Břetislav
Title: The preparation and study of catalytic system Cu(O)-CeO2 using surface analytical methods Author: Břetislav Šmíd Department: Department of Surface and Plasma Science Supervisor of the doctoral thesis: Doc. Mgr. Iva Matolínová, Dr. Abstract: This work is concerned with a study of copper/copper oxide - cerium dioxide systems and their interaction with CO and H2O molecules. Investigated samples were prepared in the form of powder catalysts and also as very well defined model inverse systems. The low temperature CO oxidation powder catalysts were studied by means of XPS, XRD, SEM, TEM and in micro-reactor system allowing the CO oxidation examination. The study of H2O adsorption and co-adsorption of H2O with CO were carried out on model inverse systems CeOx(111)/Cu(111) in ultra-high vacuum conditions using X-ray, synchrotron radiation (SRPES), resonant (RPES) photoelectron spectroscopies and LEED. It was observed on the stoichiometric surface water adsorbs molecularly at 120 K while on the reduced surface and surface of CeO2 islands on Cu(111) the H2O adsorption is partially dissociative with formation of OH groups. The increase of Ce3+ species (i.e. surface reduction) observed after H2O adsorption was explained as an electronic effect of the Ce 4f charge accumulation and Ce 5d charge depletion....
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Thermodynamic modelling of hydrogen fuel cells
Nováček, Marek ; Pavelka, Michal (advisor) ; Němec, Tomáš (referee)
In this thesis, proton exchange membrane fuel cells are studied. At the beginning, the ideas underlying their function are exposed and some possibilities of usage are pre- sented. Thereafter, we aim to describe the processes inside the fuel cells with the aid of thermodynamics and in agreement with constitutive relations that have been obtained experimentally. Namely, we are interested in the fluxes of water and protons inside the membrane, where they are acted upon by thermodynamic forces, and the electrochemical reactions at the electrodes, which can be described by the Butler-Volmer equations. Also do we study the efficiency of the fuel cell by evaluating the production of entropy due to the diverse processes that take place in the fuel cell. It is the goal of the computational part of this thesis to propose a zero-dimensional model and compare it with the results provided in the supervisor's doctoral thesis. 1
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