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Visualization of selected flows of water and cryogenic helium using tracer particles
Pilcová, Veronika ; Skrbek, Ladislav (advisor) ; Kohout, Jaroslav (referee)
Flow visualization techniques have recently been applied for the investigation of various cryogenic flows of liquid helium. Particle image velocimetry and particle tracking velocimetry techniques, proven in the past as very fruitful in many scientific and industrial areas of research, are being used for the analysis of cryogenic flows. The Joint Low Temperature Laboratory at the Charles University in Prague is the first in Europe to employ flow visualization techniques to investigate liquid helium flows. The approach had to be optimized due to a number of technical and fundamental dificulties, i.e., the optical access to the helium bath and choice of suitable tracer particles. Water experiments at room temperature were performed to prove that the experimental apparatus is well-suited for the low-temperature experiments performed as the main part of the work. The latter focused on thermal counter flow. The results from both, room-temperature experiments and low-temperature experiments are discussed and positively compared with well-known theoretical results.
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Detection of fetal abnormalities in the I. trimester of pregnancy
Pošarová, Alena ; Krofta, Ladislav (advisor)
The topic of his thesis detection of fetuses with congenital abnormalities in I. trimester of gestation , I chose based on their interest in this issue. 5 As the name suggests, the work itself , try the following pages briefly summarize methods of prenatal diagnostics with a focus on the first trimester . It medical discipline , which in recent decades has undergone dynamic development , related to the development of technical background , in particular ultrasonic techniques and laboratory methods. Birth of a child victim severe mental retardation significantly affect the future the whole family. 's why I consider it necessary to possible future parents should all available information , and hence to make responsible decisions about their future life and the life of his child . Contribution of early diagnosis of congenital defects is therefore invaluable especially for expectant parents and their chances of a healthy baby. It is also about move diagnosis of chromosomal aberrations and eventual termination pregnancy in the earliest possible stages due to mental and health impact of a pregnant woman . When drafting diplomky I , among others, drew from the grant MD . Ladislav Krofta from the years 1999-2002, and 2005 - 2007 , which are listed in literature.
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Kinematics of football's overhead throwing
Huráb, Tomáš ; Zahálka, František (advisor) ; Buzek, Mario (referee)
Title Kinematics offootball's overhead throwing Aim of research The main aim of the research was to find out of the differences between two ways of soccer throw in from point of the movement performance. We eYaluated speed of the ball during the phase ofrelease, distance ofthe throw and the trajectory of flying the ball which has stated like the criterion of performance. Movement pattem was observed by means of the spatio-temporal interaction. Methods Observed group was formed by n = 13 soccer skilled soccer players. They executed oYerhead soccer throw-in by two ways: 1) static throw-in, 2) throw-in after run up. All throws was executed in line with rules of the soccer throw-in. The speed of the ball was stated by means of radar gun STALKER. The horizontal distance and trajectory of flying phase of the ball was diagnostified by 2D kinematics analysis and evaluation of the throwing technique was realized by 3D spatial video analysis. Results The comparison of the two ways of soccer throw-in shows that higher speed of the ball during the phase of releasing and longer distance of throw was in favour of the way after run up thro\\ing. We found out the some differences between intraindiYidual attempts of the throws. It seems, that the key phase ofthis movement is backswing phase over the head and forward swing...
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Modelling of deformations of geometric objects
Kratochvíl, Erik ; Pelikán, Josef (referee) ; Kolingerová, Ivana (advisor)
Deformable models have been widely studied by the CG community for more than two decades. Many issues had to be addressed and many problems had to be solved before the quality of the deformable models reached an acceptable level. The aim of the work is to simulate interactions of several deformable bodies in realtime. First, we unveil the basic ideas behind several deformable models created for solids represented by a surface or volumetric mesh. We prefer the physicallybased approaches as they tend to yield more convincing results. We consider elastic materials only. We also briefly discuss the topic of collision detection for deformable models with its speci c aspects. A special attention is paid to contact resolution because it greatly influences the final impression. The result of this thesis is an overview of the proposed algorithm, detailed description of its parts, and its implementation. We also perform several benchmarks to prove its applicability in virtual environments and its capability to run in realtime.
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IR UWB Systems
Průdek, Ctirad ; Maršálek, Roman (referee) ; Prokeš, Aleš (advisor)
This Bachelor thesis describes essence of IR UWB systems. In the first part are described types of most used pulses. In the second part are mentioned used types of modulation pulses and division IR UWB systems according to methode of multiple acces schemes. Third part is fundamental for this Bachelor thesis. It describes structure of the IR UWB transmitters, especially most used types of pulse generators and analyses their system action in simulation programme OrCAD PSpice. Fourth section run in to the problems of IR UWB receivers and features the possible technologies of pulse detection.
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The effect of the laser surgery on the function of the ciliary epithelium of nasal mucosa
Lánský, Miroslav ; Hybášek, Ivan (advisor) ; Šlapák, Ivo (referee) ; Hahn, Aleš (referee)
Introduction: any ENT specialist meets in his praxis a treatment dilemma of impaired nasal flow. Chronic hypertrophic rhinitis belongs among the most frequent cause of bilateral nasal obstruction. The evaluation of diode laser for treatment of nasal mucosa is a possibility of surgical approach. Aim of the work: examination of subepithelial laser coagulation damage on nasal mucosa. Follow-up of the damage of the nasal mucosa on histological specimen at laboratory animals. Determination of effect of benzalconium chloride remedies on the quality of mucocilliary transport. Material and methods: domestic pig as a laboratory animal was chosen for the experimental part of the work. The mucosa of the turbinates was treated with a diode laser (wire) in a contact mode, which was applied under the epithelium. 16 animals in total were treated. Histological take-off was performed the 3rd and the 8th posttreatment day. For the clinical part a group of 89 patients was collected with a diagnosis of chronic hypertrophic rhinitis. The group was dividend to 3 subgroups. The first subgroup comprised of all patients taking a nasal steroid. The second group was formed with patients taking some of benzalconium chloride preparate (BCH). The third group was collected of patients after unsuccessful conservative treatment of...
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Evaluation of Pressure Changes During the Stance Phase of Running in Competitive Runners and Triathletes
Gerych, David ; Kaplan, Aleš (referee) ; Horčic, Josef (advisor)
5 ABSTRACT SURNAME AND NAME OF THE AUTHOR: David Gerych FIELD OF STUDY: Tělesná výchova a sport SUPERVISOR: PaedDr. Josef Horčic, Ph.D. Title: Evaluation of pressure changes during the stance phase of running in competitive runners and triathletes. The aim of the study: The aim of this thesis is to determine, whether any changes in plantar pressure distribution occur in competitive distance runners during the stance phase of continuous steady running and continuous accelerating running depending on increasing fatigue and loading intensity, as well as, to show a practical significance of tensometrics for running technique and running economy evaluation, and show the options of its application in prevention of structural and functional changes of foot resulting from an extreme loading. Methods: The thesis has a character of a pilot study. Non-homogenous group of five distance runners - two competitive male runners, two competitive female runners, and one recreational male runner, participated in this study. The analysis of plantar pressure distribution during the stance phase at the initial as well as final stage of continuous run was performed using Novel Pedar-X system. One mail competitive runner and one female competitive runner underwent continuous, gradually increasing loading, during which changes in...
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Analysis of training and competition results of the Czech representantive in the event 400 m in cycles 2004/2005 and 2006/2007
Eidrnová, Drahomíra ; Hojka, Vladimír (referee) ; Korbel, Vladimír (advisor)
Name: Analysis of training and competitions results of the Czech representant in event 400m in cycles 2004/2005 and 2006/2007. Aim of study: Aim of the study is to analyse composition, intensity and type of training workload and performance of a Czech national team 400m runner in macrocycles 2004/2005 and 2006/2007. Methods: Description and auto-analysis based on the study of specialized literature and evaluation of training diaries of Drahomíra Eidrnová. Results: We confirmed a good strategy of training. With coach Kratochvilova training focused on general endurance, tempo endurance and general strength development. In the next phase of training, coach Gruml emphasized specific endurance development, running skills improvement and dynamic strength development. In future training, it is advisable to focus on maximum speed and speed endurance development and prevent health problems by suitable recovery techniques. Keywords: athletics, 400m, performance, training
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Comparison of Conventional and New methods of Measurement and Evaluation of Luminance
Svoboda, Miloslav ; Novák,, Tomáš (referee) ; Baxant, Petr (advisor)
Because luminance is the only value to which our sight responds, its measurement becomes important in terms of ensuring the proper function of vision. Nowadays luminance measuring can be made by conventional methods, such as direct using of luminance meter. However an entirely new method of measuring luminance levels is coming. This method is based on using luminance analyzers which work using a digital photography for the analysis of luminance. This thesis deals with these issues and is divided into several chapters, which form the two main parts of the thesis, the theoretical and the practical one. The theoretical part of the thesis deals with the basics of lighting technology, as well as the principles of measuring the luminance using conventional methods. New methods of measurement, i.e. using luminance analyzers, are discussed in two chapters which analyse both the principle and characteristics of analyzers available today. In the practical part is a comparative measurement carried out – in the laboratory and in terrain – using both methods.
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Molecular biology methods and their use for HLA antigen polymorphism determination
Brožová, Jitka ; Slavčev, Antonij (advisor) ; Trošan, Peter (referee)
HLA (Human Leukocyte Antigen) is a gene segment localized on the short arm of chromosome 6. This segment consists of three regions, I. and II. region encode HLA class I and HLA class II genes, in the III. region there are the complement genes, TNFα and other genes that are not evolutionary and functionally associated with HLA genes. HLA class I and class II genes encode cell-surface glycoproteins which in their binding sites present peptides to cells of the immune system. HLA genes are associated with many autoimmune and infectious diseases, although mostly the mechanisms of these associations remain unclear. HLA function as strong transplantation antigens, thus they represent a major obstacle in allogeneic organ transplantation and transplantation of hematopoietic cells. To prevent rejection of the transplanted organ, a match between the recipient and donor in the HLA antigens is necessary. Determination of donor and recipient matching is performed by HLA typing techniques. Nowadays for HLA typing in most laboratories in Europe and the USA are used methods of molecular biology. Among these methods, three main techniques based on the polymerase chain reaction (PCR) are applied, these are PCR-sequence-specific primers, PCR-sequence-specific oligonucleotide probes and PCR-sequencing-based typing....
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