National Repository of Grey Literature 20 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Deposition of Nanocomposite Thin Films
Kratochvíl, Jiří ; Kylián, Ondřej (advisor)
Nanocomposite thin films can find application in photovoltaics, optics, fabrication of sensors, or in biomedicine. This work investigates fabrication and characterization of thin metal-plasma polymer nanocomposite films which have direct application because of their unique optical properties (e.g. SERS - Surface-Enhanced Raman Spectroscopy) or antibacterial effects (biomedicine). We fabricated metal nanoparticles either by magnetron sputtering (island growth) or by means of gas aggregation source of nanoparticles, thereby we got nanoparticles with very different morphologies. We used silver as a material for nanoparticles because of its antibacterial effects. We incorporated these nanoparticles into sputtered Nylon and sputtered PTFE (polytetrafluoroethylene) plasma polymer matrix. These two polymers have very different chemical structure and related different surface energy. First, we compared growth of nanoparticles on substrates of sputtered Nylon and PTFE. Then we compared properties of sandwich nanocomposites polymer-Ag-polymer for both types of nanoparticles and for both matrix materials. We characterized produced thin films especially with respect to their stability in water (antibacterial films), thermal stability (sterilization by heating) and stability on the open air (storage). Finally, the tests...
Detection and Vizualization of Features in a Point Cloud
Kratochvíl, Jiří ; Mikeš, Josef (referee) ; Martišek, Dalibor (referee) ; Procházková, Jana (advisor)
The point cloud is an unorganized set of points with 3D coordinates (x, y, z) which represents a real object. These point clouds are acquired by the technology called 3D scanning. This scanning technique can be done by various methods, such as LIDAR (Light Detection And Ranging) or by utilizing recently developed 3D scanners. Point clouds can be therefore used in various applications, such as mechanical or reverse engineering, rapid prototyping, biology, nuclear physics or virtual reality. Therefore in this doctoral Ph.D. thesis, I focus on feature detection and visualization in a point cloud. These features represent parts of the object that can be described by the well--known mathematical model (lines, planes, helices etc.). The points on the sharp edges are especialy problematic for commonly used methods. Therefore, I focus on detection of these problematic points. This doctoral Ph.D. thesis presents a new algorithm for precise detection of these problematic points. Visualization of these points is done by a modified curve fitting algoritm with a new weight function that leads to better results. Each of the proposed methods were tested on real data sets and compared with contemporary published methods.
Deposition of Nanocomposite Thin Films
Kratochvíl, Jiří ; Kylián, Ondřej (advisor) ; Straňák, Vítězslav (referee)
Nanocomposite thin films can find application in photovoltaics, optics, fabrication of sensors, or in biomedicine. This work investigates fabrication and characterization of thin metal-plasma polymer nanocomposite films which have direct application because of their unique optical properties (e.g. SERS - Surface-Enhanced Raman Spectroscopy) or antibacterial effects (biomedicine). We fabricated metal nanoparticles either by magnetron sputtering (island growth) or by means of gas aggregation source of nanoparticles, thereby we got nanoparticles with very different morphologies. We used silver as a material for nanoparticles because of its antibacterial effects. We incorporated these nanoparticles into sputtered Nylon and sputtered PTFE (polytetrafluoroethylene) plasma polymer matrix. These two polymers have very different chemical structure and related different surface energy. First, we compared growth of nanoparticles on substrates of sputtered Nylon and PTFE. Then we compared properties of sandwich nanocomposites polymer-Ag-polymer for both types of nanoparticles and for both matrix materials. We characterized produced thin films especially with respect to their stability in water (antibacterial films), thermal stability (sterilization by heating) and stability on the open air (storage). Finally, the tests...
Synthesis of Specifically Substituted Heterocycles via Catalytic Reactions
Kratochvíl, Jiří ; Pour, Milan (advisor) ; Kotora, Martin (referee) ; Dvořák, Dalimil (referee)
Charles University in Prague, Faculty of Pharmacy in Hradec Králové Department of Inorganic and Organic Chemistry Candidate Mgr. Jiří Kratochvíl Supervisor prof. RNDr. Milan Pour, Ph.D. Title of Doctoral Thesis Synthesis of Specifically Substituted Heterocycles via Catalytic Reactions This Ph.D. thesis deals with the synthesis of γ-alkylidene-α,β-unsaturated δ-lactones and lactams. Migita- Stille cross-coupling served as the key step in their preparation. Catalysis with palladium black was applied to the synthesis of the lactones and we demonstrated that it doesn't act as heterogeneous catalyst. Instead, it's only a precursor for catalytically active species, which is generated in situ and its true nature is unknown. The palladium nanoparticles are most likely responsible for the catalysis, although involvement of complexed atomic palladium cannot be excluded. Palladium black catalysis was also successfully applied to the synthesis of a series of structurally different substrates, which demonstrates its versatility and it was also proved that the catalyst can be easily recycled by simple filtration. An unusual Tsuji-Trost reaction then enabled transfer of the alkylidene substituent of the lactones to C5 furnishing polysubstituted heterocycles.
Influence of selected conditional factors on performance in white water slalom
Vondra, Jan ; Bílý, Milan (advisor) ; Kratochvíl, Jiří (referee)
Title: Influence of selected conditional factors on performance in white water slalom. Aims: The aim of the study was to investigate the relationship of selected specific movement abilities being examined modified test battery with the performance of athletes in the water slalom. Methods: It was used field measurements where the applied modified test battery. Using GPS module to determine the distance partial tests from batery. For measuring was used manual measurement. To determine the statistical correlation between the modified battery and performance ability of competitors was used two different coefficients of correlation and regression analysis. According to the order of the test and the race was used nonparametric correlation study - Spearman correlation coefficient. Determining the statistical significance of the relationship of measured times in tests and final time in the nomination races have used the Pearson correlation coefficient. Results: For a statistically significant relationship was determined value when r ≥ 0.8. Spearman's correlation coefficient: In the test at 40 m were obtained these correlation coefficients: Nomination races rs = 0,380952, Czech cup rs = 0,595238. In the test at 80 meters they were obtained these correlation coefficients: nomination races rs = 0,857143,...
Fabrication of metal nanoclusters and their characterization
Kratochvíl, Jiří ; Kylián, Ondřej (advisor) ; Kousal, Jaroslav (referee)
Copper nanoclusters have potencial for fabrication of nanostructured surfaces, which can be used in electronics, electrotechnics, optics and in biomedical applications. To create such surfaces, it is necessary to create and characterize the nanoclusters deeply first and this is the main topic of this work. First, we found repeatable procedure to create copper nanoclusters by the gas aggregation nanocluster source. We studied homogenity of prepared surfaces by quartz crystal microbalance and optical ellipsometry, we determined conditions for deposition of homogeneous coatings. Next, we studied deposition rate in dependence on the magnetron current, pressure in the aggregation and deposition chambers. Deposition rate linearly increased with current, but in low currents it was nearly zero. Furthermore, we found maximum deposition rate for a given pressure in the aggregation chamber and determined the range of pressure in deposition chamber where it is possible to deposit thin films of copper nanoclusters. This is important for fabrication of nanocomposite surfaces. We studied also the size, shape of nanoclusters and growth of surface by scanning electron microscope. The surfaces were very porous. We measured roughness and optical absorbance where anomalous optical absorption was found. Finally, we found that...
Synthesis and Biological Evaluation of Selected Polysubstituted Furanones
Kratochvíl, Jiří ; Opletalová, Veronika (referee) ; Pour, Milan (advisor)
The aim of this thesis was to prepare 5-(benzyloxymethyl)-3-(4-bromophenyl)-2,5- dihydrofuran-2-one derived from cytostatically active 5-alkoxymethyl-3-(4-bromophenyl)- 2,5-dihydrofuran-2-ones. However, none of the three proposed synthetic procedures led to the target molecule. Next we focused on the preparation of a series of 5-bis(acetyloxymethyl)-3- aryl-4-phenyl-2,5-dihydrofuran-2-ones with different aryl substitution derived from the antibacterially, antifungally and cytostatically active 5-bis(acetyloxymethyl)-3- (4-bromophenyl)-4-phenyl-2,5-dihydrofuran-2-one. The aim was to explore a relationship between aryl substitution in position 3 and biological activity of the compounds. The spectrum of products was also enriched by 5-acetyloxymethyl-3-aryl-4-phenyl-2,5-dihydrofuran-2-ones. In conclusion aryl substitution leads to a significant decrease or vanishing of the antibacterial, antifungal and cytostatic effects with the exception of 5-acetyloxymethyl-3-aryl-4-phenyl-2,5- dihydrofuran-2-ones, in which marginal antifungal (Absidia corymbifera), antibacterial (Staphycoccus aureus a Staphylococcus epidermidis) and significant cytostatic (L1210, HeLa S3, CCRF-CEM, IC50 < 5 µmol.l-1 ) activities were found.
Synthesis of Specifically Substituted Heterocycles via Catalytic Reactions
Kratochvíl, Jiří ; Pour, Milan (advisor) ; Kotora, Martin (referee) ; Dvořák, Dalimil (referee)
Charles University in Prague, Faculty of Pharmacy in Hradec Králové Department of Inorganic and Organic Chemistry Candidate Mgr. Jiří Kratochvíl Supervisor prof. RNDr. Milan Pour, Ph.D. Title of Doctoral Thesis Synthesis of Specifically Substituted Heterocycles via Catalytic Reactions This Ph.D. thesis deals with the synthesis of γ-alkylidene-α,β-unsaturated δ-lactones and lactams. Migita- Stille cross-coupling served as the key step in their preparation. Catalysis with palladium black was applied to the synthesis of the lactones and we demonstrated that it doesn't act as heterogeneous catalyst. Instead, it's only a precursor for catalytically active species, which is generated in situ and its true nature is unknown. The palladium nanoparticles are most likely responsible for the catalysis, although involvement of complexed atomic palladium cannot be excluded. Palladium black catalysis was also successfully applied to the synthesis of a series of structurally different substrates, which demonstrates its versatility and it was also proved that the catalyst can be easily recycled by simple filtration. An unusual Tsuji-Trost reaction then enabled transfer of the alkylidene substituent of the lactones to C5 furnishing polysubstituted heterocycles.
Tool for Communication Support Extern Participants of Event
Kratochvíl, Jiří ; Rychlý, Marek (referee) ; Kreslíková, Jitka (advisor)
The purpose of this thesis was to create application to support communication and ensuring participation of extern participants (sponsors, supporters) of an event such as conference, festival and more. Application provides support for communication between organizers and participants and o ers management of all necessary data associated with organizing event. The thesis also describes methods of project management and standards applicable for this issues. The PMBOK standard was described in detail, which was used together with ARIS methodic for application design in terms of communication, procurement and stakeholders. 
Information System on Smartphone for Teachers
Kratochvíl, Jiří ; Očenášek, Pavel (referee) ; Rozman, Jaroslav (advisor)
The purpose of this thesis was to create information system for teachers for smartphones with iOS operation system. The application should simplify work of teachers with documents such as classbook, student card and teachers own notes. The application was developed in Objective-C language in Xcode, then was tested by tools designed for this purpose and presented to potential users. The application was rated based on users feedback, taken by questionare, which was rather positive and most of asked users could imagine deploying the application into real traffic. 

National Repository of Grey Literature : 20 records found   1 - 10next  jump to record:
See also: similar author names
17 KRATOCHVÍL, Jakub
1 KRATOCHVÍL, Josef
17 Kratochvíl, Jakub
21 Kratochvíl, Jan
2 Kratochvíl, Jaromír
11 Kratochvíl, Jaroslav
2 Kratochvíl, Jindřich
1 Kratochvíl, Jonáš
1 Kratochvíl, Josef
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