|
Hyperfine interactions in maghemite and magnetite particles
Křišťan, Petr ; Štěpánková, Helena (advisor) ; Procházka, Ivan (referee)
Thesis is aimed at studying of magnetic iron oxide particles of submicron and nanoscale dimensions by means of nuclear magnetic resonance (NMR). 57 Fe NMR inves- tigations were carried out in composite bentonite/maghemite with respect to tempera- ture of calcination (Tcalc) during the sample preparation and in magnetite submicron powders with respect to various range of the particles size. One of the main findings is that increasing Tcalc improves resolution in the NMR spectra, which is most likely connected with higher degree of atomic ordering in the spinel structure. Evaluating the integral intensities of NMR spectra allowed us to determine the relative content of maghemite phase in particular samples of the series: the content rapidly grows for Tcalc up to ∼420 deg. An approach to distinguish signal from tetrahedral and octahedral irons was developed and tested on pure maghemite sample. Analysis based on vacancy- distribution models was performed in the spinel structure and the results were compared to the experiment. 57 Fe NMR spectra in submicron magnetite samples were found to differ markedly from spectrum of a single crystal. It was concluded that the investigated powders possess high amount of defects in the crystal structure or contain additional phase (probably closely related to the maghemite phase).
|
|
Vehicle usage in emergency medical service stations in the Czech Republic
BRANDEJSKÝ, Miloš
The Emergency Medical Service (EMS) is one of the basic components of the Integrated Rescue System (IRS). The development of the EMS and the usage of new technologies enable an effective emergency management. Ambulances, the emergency service vehicles, are one of the most important aspects influencing the quality of care for a patient. These vehicles ensure the arrival of the EMS personnel on the site of a critical incident as soon as possible, the protection of the personnel, the protection of the patient during he transport and the equipment of ambulances and their size influence the care for a patient. Before the purchase of these vehicles the operation area, i.e. where and on what geological setting they will operate must be taken into account. Also the active and passive safety and technical parameteres must be taken into consideration. The vehicles must also comply with legal norms and norms declared by the manufacturer. Nowadays, when the market is filled with a great number of vehicle producers, vehicles made in the Czech Republic o and Mercedes Benz and Volkswagen are preferred. Specialist firms offer a wide range of car bodies and equipment tailored to the needs of the target client. The objective of the thesis was to compare the performance of vehicles in an operation area and to examine the efficiency of ambulances. The research set was formed by the personnel of the Emergency Medical Service stations in the South Bohemian region. The South Bohemian region was chosen for the diversity of the landscape morphology. The data were gathered by the questionnaire method, the research was anonymous. I set a group of 104 respondents {--} 63 drivers and 44 medical service providers. Questionnaires were composed of questions focused on the respondents´ experience with the ambulance fleet of the EMS. The research was conducted from 4th April to 17th April 2008. Four hypotheses were set: The hypothesis I {--} ambulance drivers prefer vehicles with a classical body, was confirmed. The results are a combination of a questionnaire and a discussion with the EMS personnel. The hypothesis II {--} ambulance drivers prefer vehicles with an enlarged body {--} was not confirmed. 54 % of respondents have enough room in ambulances with a classical body, 66 % have enough room in ambulances with an enlarged body. The hypothesis III {--} in the city traffic the rendez-vous system is being used {--} was not confirmed. According to 54 % of respondents out of the total number of 104 in the city transport cars are being used, but 15 % of respondents use ambulances with an enlarged body and 22 % of respondents never use the rendez-vous system. The hypothesis IV {--} ambulances with an enlarged body have enough room for emergency interventions in the prehospital emergency care {--} was confirmed. 66 % of respondents state that there is enough room in this type of an ambulance, 10 % state that there is not. The research data analysis shows that vehicles used by the EMS are reliable, quality and safety vehicles regardless of their make. Ambulance drivers prefer the vehicles with classical body because they are used to them. They criticise the vehicles with an enlarged body because of the increased width (only rear mirrors are bigger) which is the reason for slow passage in heavy traffic or through densely built-up sites. But the EMS providers prefer ambulances with classical body because they are used to the inner layout. The ambulances with an enlarged body have enough room for emergency interventions in the prehospital care but emergency care providers are not used to another inner layout. The results of my research will be published on newly formed websites {--} health care encyclopaedia {--} section automobiles.
|
|
Integrity surface at reaming with modern reaming head MT3
Havlík, Luboš ; Plíšek, Jiří (referee) ; Kouřil, Karel (advisor)
The Masters thesis is focused on surface integrity at reaming with high productive reaming head MT3 made by HAM-FINAL. Theoretical part of thesis aims at analyse of the most frequently evalueted surface integrity parametrs and its possible influence on functional performance of machined components. Next theoretical parts are aimed at reaming process, reaming tools characteristics, detailed reaming head MT3 characteristics and its aplication in company Sauer Danfoss. The aim of experimetal part of thesis is surface integrity of holes reamed MT3 during its tool life evalation.
|
| |
|
Effect of size impact on surface integrity while reaming with modern reaming head MT3
Rybařík, Jaroslav ; Kouřil, Karel (referee) ; Slaný, Martin (advisor)
The aim of this thesis is to design, implement and evaluate an experiment that verifies the influence the size effect on selected parameters of the surface integrity. For the experiment were used highly productive reaming head MT3 made by HAM-FINAL. Evaluation of the surface integrity was done in terms of the characteristics of the surface roughness, geometric tolerances and changes in microstructure. Furthermore, the influence of the depth of chips evaluated for changes in the feed force, cutting torque and changes in specific cutting energy. The theoretical part deals with the description of the size effect, characteristic reaming, surface integrity, preparation of material and identification of highly productive MT3 reaming head.
|
|
Wiki Synchronization Tool
Louženský, Zdeněk ; Poch, Tomáš (referee) ; Kopecký, Michal (advisor)
Compact overview of existing wiki engines, their architectures, markup languages that they use and their analysis. Overview and analysis of provisioning APIs provided by wiki engines for integration with other applications. Description of existing solutions for migration of wiki content. Suggestions of possible connectors for wiki engines. Description of architecture which was used for implementation of this solution and description of its features. Description of particular modules and algorithms including description of their interfaces. Implementation of sample module and sample algorithm. Discussion and description of unified object model including its capabilities. Sample representation of wiki page in the model. Future of this open-source project. User guide.
|
|
SMV-2016-21: DA modul for EOD
Radlička, Tomáš
The program library for integrating the differential algebraic method in the EOD program was developed. The set of examples was computed which enables testing of the software.
|
|
Network with capacitor microphone using FM modulation
Lapáček, Petr ; Říha, Kamil (referee) ; Káňa, Ladislav (advisor)
In bachelor's thesis I was interested in quality of the electrostatic transducer. I have described a theoretic pieces of knowledges in parts of FM modulations and the variables crystals oscillators. I have tried to propose a conception of the condenser mikrophone in the high-frequency circuit where one of the main part was the crystal oscillator, which part was the capacitor transducer, in capacity element representative uncertain capacities. By this way I have tried to create the modulator, whose modulation depend on the actual changes of capacities in the electrostatic changers. Finally I have interested in the demodulation in this way of creating the HF signal by the help of detection unit TDA7000 and likewise setup of integrated circuit.
|
|
Function generator
Húsek, Jan ; Mišurec, Jiří (referee) ; Káňa, Ladislav (advisor)
Bachelor`s thesis deals with design and realization of one possible solution of function generator with use of integrated circuit XR 2206. This function generator operates in frequency range 10Hz – 100kHz and it is designed to generate square, triangle and sine waveforms with variable duty and output amplitude to 10Vpp. Function generator contains inputs for amplitude and frequency modulation.
|
|
Panel of monoclonal antibodies – alternative tool For monitoring of sperm–zona pellucida receptors localization and identification
Zigo, Michal ; Dorosh, Andriy ; Pohlová, Alžběta ; Jonáková, Věra ; Šulc, Miroslav ; Maňásková-Postlerová, Pavla
Primary binding of the sperm to the zona pellucida (ZP) is one of the many steps necessary for successful fertilization in all sexually reproducing species. Sperm bind ZP by means of membrane receptors which recognize carbohydrate moieties on ZP glycoproteins according to a well-precised sequential process. Primary-binding receptors are localized throughout the acrosomal region of the sperm surface of which many have been disclosed in various mammals. For the monitoring sperm-zona pellucida receptors in terms of localization and characterization - panel of monoclonal antibodies against proteins from the sperm surface was prepared. Antibodies were screened by immunofluorescence and Western blotting for protein localizations and competence of antibodies, respectively. Antibodies recognizing proteins localized on the sperm head and simultaneously detected by Western blot were further studied by means of immunolocalization in reproductive tissues and fluids, binding to ZP, immunoprecipitation and protein identification using MS analysis. Out of 17 prepared antibodies, 8 antibodies were simultaneously recognizing proteins localized on the sperm head and detecting proteins of interest by Western blotting. Further only 3 antibodies recognized proteins which also coincided in binding to ZP. These 3 antibodies were used for immunoprecipitation, and further protein identification of immunoprecipitates revealed that the antibodies distinguish acrosin precursor, RAB2A protein, and lactadherin P47. Acrosin and lactadherin P47 have been already detected on the sperm surface and their physiological functions in reproduction have been proposed. To our knowledge, this is the first time RAB2A has been found on the surface of sperm and its physiological function in the process of fertilization remains undisclosed.
|
guest ::
