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Research of organic layers for solar cells
Pečeňa, Rastislav ; Toušek, Jiří (advisor) ; Křivka, Ivo (referee)
Title: Research of organic layers for solar cells Author: Rastislav Pečeňa Department: Department of Macromolecular Physics Supervisor: doc. RNDr. Jiří Toušek, CSc., Department of Macromolecular Physics Abstract: The main object of this project is to determine some parameters of polymer layers PPV (poly(p-phenylene vinylene)), which are important for usage of solar cells. We will do that by measuring spectra of surface photovoltage, from which we can get particular parameters of material by their fitting: such as exciton diffusion length, thickness of space charge region (SCR), surface recombination velocity of excited electrons. The dependence shows where material is inducing the highest current density. Some measurements of organic materials enriched with nanoparticles will also take place. It is possible to find an approx. diameter of nanoparticles from spectral dependence of voltage. Keywords: solar cell, diffusion length, nanoparticles, organic layer
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A Minorityness of the Church and its Self-perception
Pečeňa, Rastislav ; Beneš, Ladislav (advisor) ; Landová, Tabita (referee)
This thesis is focused on actual situation of a church membership in Czech Republic. Firstly, it determines the term church in the biblical context and then it does a sociological-historical research of the Czech church membership and the self-perception of the churches. The aim of this thesis is also to determine the term church by self-perception, minorityness and actual situation of five selected Czech churches: the Roman Catholic Church, the Orthodox Church, the Protestant Church of Czech Brethren, the Czechoslovak Hussite Church and the Church of Brethren. Each of these churches has a different character, on which it is possible to well observe the individual characteristics and manifestations of the particular church. This is the basis for rising or decreasing of the number of church members. The thesis researches as well the self-determination of these churches against other churches, other religions and against nonbelievers. It asks a question: Who belongs to church, and who does not any more? Last but not least, we analyse a question of the "Czech atheism" which is interwoven with the minorityness and we look for the sociological, historical and ecclesiological reasons for it. Powered by TCPDF (www.tcpdf.org)
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The Differences in Interpretation and Practice of the Lord's Supper between Roman Catholic Church and Protestant Churches
Pečeňa, Rastislav ; Filipi, Pavel (advisor) ; Vaňáč, Martin (referee)
The Differences in Interpretation and Practice of the Lord's Supper between Roman Catholic Church and Protestant Churches This Bachelor's thesis deals with characteristics of the Lord's Supper in particular churches. These are Roman Catholic Church and two types of protestant churches - the churches of Augsburg Confession and the churches of Helvetic Confession. The task of this thesis is to point out and to compare the most discussed elements and nexuses related to the Lord's Supper from the theoretical view of confession of each church as well as from the view of its practice - concretely how administration of the Lord's Supper takes place and what is necessary for it, how can be dealt with it, who can be the administrator and who can accept and the like. Mostly, it is used the primary literature, which particular churches use (catechisms, codes, agendas…). On the other hand, it is used the secondary literature to put in nexuses as well. There are two documents of ecumenical agreements from the second half of the last century mentioned in conclusion - especially their views of the Lord's Supper. These should point out the hope of unity of church, which is not fully possible yet, but which church apparently aims to. In supplements, there is described a very short history of oecumene. It follows the...
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Research of organic layers for solar cells
Pečeňa, Rastislav ; Toušek, Jiří (advisor) ; Křivka, Ivo (referee)
Title: Research of organic layers for solar cells Author: Rastislav Pečeňa Department: Department of Macromolecular Physics Supervisor: doc. RNDr. Jiří Toušek, CSc., Department of Macromolecular Physics Abstract: The main object of this project is to determine some parameters of polymer layers PPV (poly(p-phenylene vinylene)), which are important for usage of solar cells. We will do that by measuring spectra of surface photovoltage, from which we can get particular parameters of material by their fitting: such as exciton diffusion length, thickness of space charge region (SCR), surface recombination velocity of excited electrons. The dependence shows where material is inducing the highest current density. Some measurements of organic materials enriched with nanoparticles will also take place. It is possible to find an approx. diameter of nanoparticles from spectral dependence of voltage. Keywords: solar cell, diffusion length, nanoparticles, organic layer
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