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English counterparts of Czech finite subjectless clauses
Pospíšil, Jan ; Malá, Markéta (advisor) ; Šaldová, Pavlína (referee)
The thesis focuses on the English counterparts of a Czech clause type which does not exist in English - finite subjectless clauses. These Czech clauses with a verbal or verbo-nominal predicate correspond to English clauses with a subject and a predicate. The thesis describes the repertoire of means used as subjects of the English constructions, also examining the factors which influence the choice of a particular subject and predicate, and the structure of the English sentence. The most influential factors are linked with the semantic class of the clause, i.e. whether it refers to the states of the surrounding environment or physical and psychical states, whether a general human agent is implied, or whether the meaning of the clause is associated with modality. The material is extracted from the Czech-English parallel corpus InterCorp. One hundred examples of Czech finite subjectless clauses were obtained from Czech original texts (the "core" texts). The clauses extracted comprise predicates which include the third person singular of an active past participle, i.e. Setmělo se. Došlo k nedorozumění.
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Study of transistor properties with ionic liquids
Mitáčková, Martina ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
This diploma thesis is focused on the study of electric and dielectric properties of transistors based on ionic liquids. The measurements were performed on organic electrochemical transistors with a semiconducting channel made of PEDOT:PSS, which were firstly prepared on ITO substrates, later they were printed using 3D print. Ionic liquid NO4 (1-butyl-3-methylimidazolium hydrogensulfate) was used for measuring of the properties. Electrical properties were determined by measuring volt-ampere characteristics, dielectric properties were measured by impedance spectroscopy.
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Study of Electric Properties of Electrochemical Transistors with Ionic Liquids
Blahut, Jan ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
This bachelor’s thesis is focused on preparation of organic electrochemical transistors and following characterization of electric properties of these systems. Two types of electrode systems were used for preparation – glass substrates with steamed oxide of indium and tin and polylactic acid substrates with admixture of carbon soot. Three methods were tested for creation of PEDOT channel. Materiál printing, spin-coating and manual application. The measurement shows, that voltage applied to gate electrode has no effect switching of transistor. Size and polarity of current between source and drain electrodes has a major influence here.
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Study of electrical and dielectric properties of perovskites
Moravčík, Marek ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
This bachelor’s thesis is focused on a study of electrical and dielectrically properties of perovskite single crystal prepared by inversed temperature crystallization. Measurement was done on sample of MAPbBr3. First the temperature dependences of current-voltage characteristics were measured, they help to determined Arrhenius dependences. Activation energies were determined from Arrhenius dependences for every single voltage. These activation energies were used to determined position of Fermi level during thermodynamic balance. Concentration of state for dominant energies and charge carrier mobility (drift, microscopic) were determined from current-voltage characteristics for constant temperature. Relative permittivity was used to determine these parameters from impedance measurement.
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Czech Drama in Early Modernism: The Portrayal of Leaders
Pospíšil, Jan ; Vojtěch, Daniel (advisor) ; Sílová, Zuzana (referee) ; Topolová, Barbara (referee)
The thesis constitutes the analysis of selected Czech dramas from the beginning of the 20th century representing various portrayals of national leaders. In my view, the dramas are Apollonian images of a kind representing the dreams of their creators about the strength and greatness, both individual and national. That is because, on one hand, the national leader is an exceptional individual, an exquisite human specimen and as such he or she corresponds to Nietzsche's characterization of a tragic hero as the highest phenomenon of the will. But at the same time, he or she is a national educator. Individual works represent various forms of how the leader educates and edifies the nation and whether he or she leads by command or by example. The dramas show us the leaders, who not only tame, purify, but also urge to growth those, whom they lead. The approach of the Czech playwrights is essentially mythopoetic. Their works constitute contributions to the creation or re-creation of national mythology, in other words, they deal with the meaning of the existence of the nation, or the national condition. They represent a dialogue or a polemic with one particular national mythology formed at the time that of T. G. Masaryk as he stated it in his works Česká otázka (1895), Naše nynější krise (1895), and Jan Hus...
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Implementation Of Fsk Modulated Signal Receiver Using Software Defined Radio
Pospisil, Jan
This paper discusses recent trends in a wireless communication system using Software DefinedRadio (SDR). SDR, in this case, the BladeRF 2.0, in combination with a software layer writtenin the Python language, is taking care of signal demodulation. BladeRF 2.0 is a device that providesa powerful waveform development platform expected by industry professionals. The BladeRF 2.0 isused to design a Frequency Shift Keying (FSK) receiver (in the form of binary data). As a transmitter,we created a custom-designed end-device using CC1101 RF (Radio Frequency) module. The scenarioin the current experiment is that the SDR acts as a receiver for the transmitting end-node.
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Comparison Of Promising Tdoa Geolocation Algorithms For Low-Power Wide-Area Network
Pospíšil, Jan
The paper deals with the comparison of promising end-device geolocation algorithms in a multipath propagation environment using the Time-Difference of Arrival (TDoA) information, that is incoming signal propagation delays from the end-device to the gateways. Comparison by simulation with added noise to outline the real conditions for a variety of selected computational algorithms. Namely comparison of the sensitivity of the algorithms to noise, the influence of the gateway count on the positioning error and calculation time requirements have been done.
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Perovskite single crystals for the detection of electromagnetic radiation
Gavranović, Stevan ; Novák, Vítězslav (referee) ; Pospíšil, Jan (advisor)
This thesis is focused on the study of the detection of electromagnetic radiation using monocrystalline perovskites. Theoretical part deals with basic principles of detections and possible applications of hybrid perovskite crystals in the field of ultraviolet and visible spectrum detection. Parameters of the recently published perovskite photodetectors are also presented. Experimental part describes synthesis, structural and optical properties of MAPbBr3 single crystals and electrical characterization of the Au/MAPbBr3/Au photodetector. Photodetector parameters (responsivity, external quantum efficiency and specific detectivity) are calculated based on the spectral and switching (on/off) current responses.
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Study of the dielectric properties of perovskite crystals
Mlčkovová, Hana ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
The presented diploma thesis deals with the preparation of perovskite single crystals by inverse thermal crystallization and subsequent study of the basic properties of these hybrid organic-inorganic materials that can be used in various optoelectronic (photodetectors, transistors, lasers, LEDs) or photovoltaic applications. Their behavior in the electric field was studied by impedance spectroscopy. Impedance and capacitance-voltage (C-V) characteristics (frequency dependences) were measured in the dark and in the light. From the impedance dependences for measurements at 0 V voltage in the dark, the equivalent circuit was modeled and its parameters and dielectric constant were determined. From the C-V dependence, Mott-Schottky analysis determined the parameters – "flat-band" potential U_"fb" and charge carrier density N_"C-V" , the parameter – the so-called Warburg coefficient was found, which together with the parameter N_"C-V" was used to calculate the diffusion coefficient D.
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Passivation of the active layer in perovskite solar cells with inverted architecture
Babincová, Kristina ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The topic of this work is the passivation of the active layer of perovskite solar cells with an inverted structure. The work is divided into theoretical and experimental part. The theoretical part describes in particular the passivation and modification of the perovskite layer as well as the characteristic properties of perovskite, including structure and stability. The experimental part deals with the preparation of photovoltaic cells with an inverted structure. For the characterization of photovoltaic cells, reference samples were prepared and their active layer was modified by plasma. The most used deposition technique for the preparation of layers was the spin coating method. From the performed experiments it can be concluded that the preparation of samples and their subsequent modification under laboratory conditions does not lead to the improvement of the final parameters of photovoltaic conversion. By transferring the sample preparation and passivation of the active layer to an inert atmosphere, it was possible to produce cells with higher efficiencies (compared to the reference sample), around 10 %. Another advantage of this plasma treatment of the active layer is that it also improves the stability of the prepared structures, which even after a few days in air show almost 80 % of the original efficiency.
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