|
|
Analysis of exhibitions in Rumburk museum
Kusová, Kateřina ; Jareš, Jakub (advisor) ; Sixta, Václav (referee)
This thesis deals with the analysis of exhibitions in the Rumburk museum. The aim of the thesis is to analyze the formal and content aspects of exhibitions. This analysis is based on the method of Thomas Thiemeyer. Criticism of the exhibitions is based on criticism of historical sources. This method is based on a series of questions that are modified according to the exhibitions' character. The theoretical part of the thesis deals with local museums and their role in society. In the next part, the thesis focuses on "small museums" which is as Rumburk museum as well. In the next part, the thesis focuses on the history and today of the Šluknov promontory region, which is Rumburk part of and it also presents Rumburk itself. In the last theoretical part, the thesis focus on the history and today of the Rumburk museum. The practical part at first focus on a detailed description of the exhibitions. The next part focus on formal and content analysis of exhibitions and their parts. From formal analysis follows that exhibitions are designed nouniform. Carriers of meanings are mostly exhibits. Visitors are not considered as part of exhibitions and they can not participate in them. From content analysis follows that are mostly focused on the 18th and 19th centuries. These centuries were significant for the...
|
|
| |
|
|
Dynamics of delocalized states in molecular systems studied by time-resolved THz spectroscopy
Mics, Zoltán ; Kužel, Petr (advisor) ; Jepsen, Peter Uhd (referee) ; Kůsová, Kateřina (referee)
This thesis is devoted to a study of the conductivity of confined charge carriers in various nanocrystalline materials. The experimental method -- THz spectroscopy -- involves measurements of the conductivity of carriers generated by doping or by optical excitation. In the theoretical interpretation of measured data we address important aspects of carrier transport, connected to the microscopic inhomogeneity of samples and the nanoscale confinement of carriers. We focus on the study of nanocrystalline ZnO and CdS using simulations and experiments in a wide range of carrier densities and for several temperatures. In ZnO, the interplay of highly mobile electron-hole gas, dense electron-hole plasma and population of excitons was observed. In CdS the investigation reveals the importance of clusters of nanocrystals in the electron confinement. The dynamics of the electron mobility at different carrier densities show the role of the kinetic energy of electrons and its relaxation in the carrier transport in nanostructured systems. At temperatures 20 K and at low carrier densities a crossover between localized transport and Drude-like free electron behaviour was observed for the first time.
|
|
| |
|
| |
|
|
Light Emission from Materials Based on Silicon
Kůsová, Kateřina
New characterization techniques based on the use of local luminescence probes enable to study the properties of various nanostructures for optoelectronic applications with high (nanometric) spatial resolution. An experimental setup for measuring by one of these methods, namely, the photon emission induced with the tip of a scanning tunnelling microscope (PESTM), has been built.In the future, this setup will be used for studying the luminescence from individual silicon nanocrystals in contrast to traditional macroscopic measurements providing only the information on the light emission from a large number of nanocrystals. Nanocrystalline silicon is a promising material in which the light emission is enhanced, in contrast to monocrystalline silicon, by quantum connement.Optoelectronic properties of two series of samples containing this interesting material were measured.Firstly, a weak electroluminescence signal and reasonable transport properties of samples prepared by embedding electrochemically etched silicon nanocrystals into SiO2 matrix, and secondly, a conductive path created between individual silicon nanocrystals implanted in a silica glass slab were observed.Besides, for the latter series of samples, an interference model was developed and used to describe their structure. All these results are...
|
|
|
Dynamics of delocalized states in molecular systems studied by time-resolved THz spectroscopy
Mics, Zoltán ; Kužel, Petr (advisor) ; Jepsen, Peter Uhd (referee) ; Kůsová, Kateřina (referee)
This thesis is devoted to a study of the conductivity of confined charge carriers in various nanocrystalline materials. The experimental method -- THz spectroscopy -- involves measurements of the conductivity of carriers generated by doping or by optical excitation. In the theoretical interpretation of measured data we address important aspects of carrier transport, connected to the microscopic inhomogeneity of samples and the nanoscale confinement of carriers. We focus on the study of nanocrystalline ZnO and CdS using simulations and experiments in a wide range of carrier densities and for several temperatures. In ZnO, the interplay of highly mobile electron-hole gas, dense electron-hole plasma and population of excitons was observed. In CdS the investigation reveals the importance of clusters of nanocrystals in the electron confinement. The dynamics of the electron mobility at different carrier densities show the role of the kinetic energy of electrons and its relaxation in the carrier transport in nanostructured systems. At temperatures 20 K and at low carrier densities a crossover between localized transport and Drude-like free electron behaviour was observed for the first time.
|
|
| |
|
| |
|
|
Light Emission from Materials Based on Silicon
Kůsová, Kateřina
New characterization techniques based on the use of local luminescence probes enable to study the properties of various nanostructures for optoelectronic applications with high (nanometric) spatial resolution. An experimental setup for measuring by one of these methods, namely, the photon emission induced with the tip of a scanning tunnelling microscope (PESTM), has been built.In the future, this setup will be used for studying the luminescence from individual silicon nanocrystals in contrast to traditional macroscopic measurements providing only the information on the light emission from a large number of nanocrystals. Nanocrystalline silicon is a promising material in which the light emission is enhanced, in contrast to monocrystalline silicon, by quantum connement.Optoelectronic properties of two series of samples containing this interesting material were measured.Firstly, a weak electroluminescence signal and reasonable transport properties of samples prepared by embedding electrochemically etched silicon nanocrystals into SiO2 matrix, and secondly, a conductive path created between individual silicon nanocrystals implanted in a silica glass slab were observed.Besides, for the latter series of samples, an interference model was developed and used to describe their structure. All these results are...
|
guest ::
RSS feed.