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Thermoacoustic measurement of ultrasonic power
Kučera, Václav ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
The thesis deals with ultrasound intensity and power measuring methods of the medical diagnostic systems, especially with thermoacoustic method. Then the concept of thermoacoustic sensor is processed and it is checked by comparison with the power of ultrasound system measured by the hydrophone in ultrasonic measuring tank. In the leading chapter basic parameters of general ultrasonic field are described. Next part deals with particular ultrasound intensity and power measuring methods. The last part deals with projecting of the thermoacoustic sensor, measuring with this sensor, measuring with hydrophone and comparison of this measurements.
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Measurement of laser source with a cylindrical lens
Jelínek, Aleš ; Šedivá, Soňa (referee) ; Bejček, Ludvík (advisor)
The purpose of this work is to design and create device for measuring the light intensity of laser source with cylindrical optics. It will be used to check laser source attributes during it's construction – primarily steady illumination along the whole line. The main goals were the minimization of construction complexity, reduction of cots and of course achieving all requirements. The product is fully functional machine, which works in company today.
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Transport concept in Ujezd u Brna
Rybárová, Martina ; Hloušková, Milada (referee) ; Matuszková, Radka (advisor)
The subject of the diploma thesis is the concept of transport in the municipality Újezd u Brna. The main task of my thesis is to analyze the current state of static transport and public transport in the municipality. Another task is to analyze accident rates and risk spots in the municipality with the aim of increasing safety for all road users. No less important part of the thesis is measurement of traffic engineering data including directional survey. Four locations were selected for data research and evaluation.
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Traffic lanes merging analysis and possible improvement measures
Mikolášek, Igor ; Ščerba, Marek (referee) ; Holcner, Petr (advisor)
The presented thesis deals with lane merging at lane drops. The theory of traffic flow is briefly introduced and put into the perspective of lane merging. Forming of queues at lane drops, the capacity drop and traffic flow behaviour at lane merging is explained. A review of existing measures at lane drops at work zones and elsewhere is provided. Measurements of traffic flow from three different locations are presented. The locations are introduced, the methods used for analysis of the data are explained and the results are provided and discussed. The capacity drop is confirmed and the first proof of concept of the later introduced metering system is presented. The behaviour of the merging drivers was found to have a significant influence on the merging capacity during congestion. Further, an overview of existing applications of traffic light in traffic flow control is provided and ramp metering and mainstream metering is explained. The new metering system for lane drops is presented including several possible modifications and extensions. Finally, the proposed metering system is tested in microsimulation software Aimsun. The simulations further confirm the viability of such systems. It brings significant capacity improvements and consequently even greater improvements of delays and travel times due to shorter queues.
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Analysis of traffic lanes joining processes
Mikolášek, Igor ; Všetečka, Martin (referee) ; Holcner, Petr (advisor)
The aim of this paper is to analyse the behaviour of the traffic flow at an area of merging traffic lanes where an application of the zip rule is expected, accoding to the law no. 361/2000 Sb. “o provozu na pozemních komunikacích”. Žabovřeská street, part of the VMO Brno, in the direction from Královopolské tunely to Hlinky interchange was chosen for observation and measuring. Observation, first-hand measurement, radars, and other available means were used for data collection. On the basis of data analysis, several suggestions for improvements are made. These are aimed at increasing the bottleneck capacity. One of the suggestions is tested in a simulation program Aimsun.
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Analysis of prosodic and spectral properties of voice communication in air traffic control
Simonides, Jakub ; Kopřiva, Tomáš (referee) ; Smékal, Zdeněk (advisor)
This thesis analyses the prosodic and spectral features of bi-directional air traffic control communication, describes how to communication was split to segments, according to the source, via transcription. After the splitting, the segments are deeply analyzed for their spectral and prosodic features. The analysis itself, focuses on the spectral aspects of intensity, fundamental frequency F0, slope and centroid. Additionally, tempo and voice activity detection data were measured, to support the spectral aspects as well. Because of the differences between the ATC controller’s and pilots’ spectral aspects, the direction of the communication can be automatically determined, with relatively high success percentage.
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Analysis and Innovation systems of Vehicle Lighting
Straka, Ondřej ; Grmela, Petr (referee) ; Hájek, Vítězslav (advisor)
ubject semestral project is diagnosis primary objective luminosity plus elaboration background research primary objective plus modern waies lighting. Work includes indicative allocation light fitting, systems plus possibilities increasing safeness on roads by using modern systems facilitating movement and behind handicap. Are here also circumscribed systems facilitating visibility in night o'clock plus manners realization of all these systems.
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Resonance energy transfer in the environment of the hydrogel matrix
Janča, David ; Venerová, Tereza (referee) ; Mravec, Filip (advisor)
The diploma thesis deals with resonance energy transfer in hydrogel matrix enviroment. In the theoretical part, all the important features of these systems and their components are summarized and all the principles for explaining the method used are described. The work also includes a short literary background research. In the experimental part, the resonance energy transfer was measured in micellar solutions and hydrogels in 0.15 M NaCl medium. The hydrogels were formed on the basis of interaction of the surfactant with the oppositely charged polyelectrolyte. As a positively charged surfactant, carbethopendecinium bromide (Septonex) was chosen and hyaluronan as the negatively charged polyelectrolyte. Perylene with fluorescein and perylene were selected as fluorescent pairs for RET. It has been found that increasing concentration of the acceptor molecule increases the intensity of RET, in other word the rate of acceptor binding to the donor. In the study of fluorescent pair of perylene with DiO was observed, that it was not appropriate to use fluorescence probe DiO at higher concentrations. Experiments were carried out to determine whether RET changes in the time from the point of mixing the donor and acceptor fluorescence probes together. This phenomenon has not been confirmed. In hydrogels, the effect of increasing surfactant concentration and molecular weight of hyaluronan was observed. The resulting analysis showed that the molecular weight of hyaluronan has a significant effect on RET efficiency in hydrogels.
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Model Study of Ultrasound Effects on Fetal Development
Jaroš, Josef ; Halámek, Josef (referee) ; Hrazdíra,, Ivo (referee) ; Rozman, Jiří (advisor)
The progress in ultrasound techniques goes hand in hand with increasing of diagnostic machine acoustic outputs. Ultrasound biological effects can adversely influence the development of human fetus. Recent studies of thermal effect on biological tissues are usually based on simulation of simple ultrasound transducers. The aim of this work is to build a flexible model of diagnostic system to simulate temperature increase during fetal development. Different types of ultrasound probes were used for generation of acoustic field with simulated piezoelectric element properties. Optimized linear and phased arrays were modeled with dynamic beam steering and focus. Computer simulations were concentrated on extreme conditions in obstetric ultrasonography and 3D tissue model was compared with real ultrasound probes measurements. To detect temperature increase, the bone tissue phantom was used. Results point out potential risks for fetus with diagnostic ultrasound probes. Based on the results of this work, practical recommendations increasing safety of obstetric examinations were drawn.
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Competitive choreography analysis of the Fitness Step Adults category in the finals of the World championships in the years 2013 and 2019
Kampová, Tereza ; Hájková, Jana (advisor) ; Panská, Šárka (referee)
TITLE: The competitive performance analysis of Fitness Step Adults category in the finals of the World Championsips 2013 and 2019 AUTHOR: Tereza Kampová DEPARTMENT: Department of Physical Education SUPERVISOR: PaedDr. Jana Hájková ABSTRACT: The topic of this thesis is the analysis of competition sets in the Fitness Step Adults category in the 2013 and 2019 World Championships' finals. The main aim of this work is to analyze and compare the choreographies from these two years in terms of the development of difficulty, intensity and variability of the competition sets and to evaluate how the choreographies have changed after the rules had been altered. Individual choreographies from the year 2013 and 2019 are firstly evaluated in accordance with the rules and requirements of FISAF International and then compared with each other. Moreover, the comparison is subsequently supplemented by an interview with a coach and, at the same time, a participant in both World Championships in the role of a competitor. The conducted research revealed that the choreographies had changed its character since 2013. The choreographies of 2019 use different elements that help elevate the intensity of the set. Elements such as formation changes and exchanges between team members have reached a higher difficulty. In contrast with...
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