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OFDM demodulator implementation in FPGA
Solar, Pavel ; Urban, Josef (referee) ; Maršálek, Roman (advisor)
The master's thesis briefly analyses the principle of OFDM modulation, possibilities of the synchronization and channel estimation in OFDM. The simply model of OFDM system is made in MATLAB. Because of the implementation in FPGA is generated the behavioral description of the OFDM demodulator through the combination of the schematics description and the description in the VHDL language. The ISE development environment is used.
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Nanostructured films based on plasma polymers
Solař, Pavel ; Shukurov, Andrey (advisor) ; Vyskočil, Jiří (referee)
In this thesis we have studied growth and properties of thin films prepared by tilted deposition using sputtering. The construction of low pressure magnetron is presented. The influence of deposition conditions on formation of columnar structure using scanning electron microscope was studied. Formation of columnar structures of metals, composites metal-plasma polymer and plasma polymer is described. The influence of deposition conditions on surface roughness obtained by AFM is discussed. Chemical structure of composite and plasma polymer films has been determined using XPS and infrared spectroscopy.
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Influence of non-equilibrium plasma on seeds
Červenková, Veronika ; Kylián, Ondřej (advisor) ; Solař, Pavel (referee)
Agriculture was, is and will always be one of the most important economic sectors owing to its primary purpose: the global food security. Forming the base pillar of the so- ciety's system, it is the privilege of nations to make their products accessible to everyone, regardless of the environmental or economical conditions. The employment of the newest technologies in order to secure its regulation gave rise to a brand new field of science - plasma agriculture. Plasma agriculture examines the use of non-thermal plasma on natural sources with diverse objectives. Soil rehabilitation, microbial food decontamination or insecticide acti- vities are not the only examples. In this thesis we shall devote to the DBD air plasma application on the Pumpkin seeds (sort Small Sugar) in order to improve its germination. After verifying the selected plasma source impact on eight polymer foils the main focus was given to the seeds. It was found that the plasma treatment induces changes in the chemical composition and water droplet drying dynamics that in turn result in dramatic increase of surface wettability. These changes must not have been accompanied by the burning; otherwise the treatment led to a radical disruption of seeds' morphology and to failure of the essential - enhancement of the germination rate. 1
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Study of velocities of nanoparticles produced by means gas aggregation source
Škorvánková, Kateřina ; Solař, Pavel (advisor) ; Nikitin, Daniil (referee)
A mechanical time-of-flight filter designed for measuring velocities of nanoparticles produced by gas aggregation source has been developed. The emphasis is placed on the resolution and accuracy maximization as well as on simplicity of use. It is shown that the experimentally measured data (influenced by the design of the filtr) may be converted to the real velocity distribution and a method of conversion is presented. Subsequently, the filter is used to measure velocities of nanoparticles produced under various experimental conditions and the dependence of the velocity on given conditions is shown. Furthermore, a sample for every experimental setup has been prepared for SEM analysis to determine size distribution of the nanoparticles. Finally, the size dependence of velocity is illustrated.
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Nanostructured films based on plasma polymers
Solař, Pavel
In this thesis we have studied growth and properties of thin films prepared by tilted deposition using sputtering. The construction of low pressure magnetron is presented. The influence of deposition conditions on formation of columnar structure using scanning electron microscope was studied. Formation of columnar structures of metals, composites metal-plasma polymer and plasma polymer is described. The influence of deposition conditions on surface roughness obtained by AFM is discussed. Chemical structure of composite and plasma polymer films has been determined using XPS and infrared spectroscopy.
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Preparation of nanostructured and nanocomposite thin films with plasma polymer matrix
Solař, Pavel ; Biederman, Hynek (advisor) ; Novák, Rudolf (referee) ; Tichý, Milan (referee)
Title: Preparation of nanostructured and nanocomposite thin films with plasma polymer matrix Author: Pavel Solař Department: Department of Macromolecular Physics, MFF, UK Supervisor of the doctoral thesis Prof. RNDr. Hynek Biederman, DrSc., Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University in Prague Abstract: This thesis is devoted to study of nanostructured thin films implementing metal and plasma polymer particles and columns. Process of formation of particles from various materials has been studied. The particles size, shape and chemical composition has been characterized relative to the deposition conditions. Transport of metal and plasma polymer particles inside the particle source and from the particle source to substrate has been investigated. The particles were used in composite films especially to produce films with controlled roughness e.g. for investigation of influence of roughness on adhesion of cells. Preparation of columnar films by Glancing Angle Deposition has been studied and the particles have been used as seeds for the columnar growth. Keywords: Nanoparticles, Glancing Angle Deposition, plasma polymer, composite thin film
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Nanostructured films based on plasma polymers
Solař, Pavel
In this thesis we have studied growth and properties of thin films prepared by tilted deposition using sputtering. The construction of low pressure magnetron is presented. The influence of deposition conditions on formation of columnar structure using scanning electron microscope was studied. Formation of columnar structures of metals, composites metal-plasma polymer and plasma polymer is described. The influence of deposition conditions on surface roughness obtained by AFM is discussed. Chemical structure of composite and plasma polymer films has been determined using XPS and infrared spectroscopy.
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Nanostructured films based on plasma polymers
Solař, Pavel ; Shukurov, Andrey (advisor) ; Vyskočil, Jiří (referee)
In this thesis we have studied growth and properties of thin films prepared by tilted deposition using sputtering. The construction of low pressure magnetron is presented. The influence of deposition conditions on formation of columnar structure using scanning electron microscope was studied. Formation of columnar structures of metals, composites metal-plasma polymer and plasma polymer is described. The influence of deposition conditions on surface roughness obtained by AFM is discussed. Chemical structure of composite and plasma polymer films has been determined using XPS and infrared spectroscopy.
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