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Diagnostics of semiconductors properties
Šeliga, Ladislav ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This thesis describes the basic properties of semiconductor materials and methods of their measuring. In the first part of this work are discussed elemental semiconductors, semiconductor compounds and the band structure. The next section describes current conduction in semiconductors, methods for measuring resistivity. This work is focused on the measuring drift mobility of minority charge carriers using the Haynes-Shockley method for a sample of silicon semiconductor, the creation of automated workplace in the development environment VEE Pro and resistivity measurements of silicon samples.
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Morphology and Mobility of Vertebral Column in Human Biology Lower Secondary School Education
Spáčilová, Šárka ; Ehler, Edvard (advisor) ; Hlaváčová, Lucie (referee)
This master's thesis examines the topic of the structure and mobility of the spine in the teaching of biology in the eighth grade of elementary schools and the third grade of multi-year grammar schools (Gymnasiums). The aim of the thesis is to identify misconceptions held by students within the selected topic. The first part is theoretical. At the start, I analyse curriculum documents and define the term misconception, then I provide a brief description of the anatomy of the spine and trunk and the definition of mobility and in the last section I deal with musculoskeletal disorders, especially the VDT - poor posture and its prevention. The second part of the thesis is practical. Here, I first discuss the methodology of textbook analysis and the questionnaire survey. The aim of the textbook analysis is to determine the scope of the material on the musculoskeletal system in the textbooks, focusing on the topic of spinal structure and mobility. The introductory analysis is followed by a questionnaire compiled to identify students' misconceptions about the given topic. In the second section of the practical part, I evaluate the results of the textbook analysis and the questionnaire survey. The skeletal and muscular system as well as the structure of the spine and disorders of the musculoskeletal system...
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The difference in range of motion between dominant and non-dominant upper extremity of female volleyball players
Štěpánová, Anna ; Vorálek, Rostislav (advisor) ; Petružela, Jan (referee)
Title: The difference in range of motion between dominant and non-dominant upper extremity of female volleyball players. Objectives: The aim of this study is to compare the shoulder range of motion of dominant and non-dominant upper extremity of female volleyball players. The work should inform about the extent of muscle dysbalancies caused by asymetric loading. Methods: The study is qualitative and all the data will be obtained by measurements. For measuring i will utilise hypermobility tests by Janda as a foundation but mainly the goniometry. The data were proseded with respect to studied literature dealing with this topic. Results: Evaluation of range of motion and coparison with the physiology. Key words: volleyball, range of motion, mobility, shoulder joint, goniometry
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Study of electric and photoelectric effects in organic semiconductors
Chomutová, Radka ; Toušek, Jiří (advisor) ; Pfleger, Jiří (referee)
This work studies various electrical properties of polymer layers of polyaniline, polythiophenes and poly(((benzothiadiazol)4,7-di(thien-2-yl)-5,6-difluoro-2,1,3-benzothiadiazol). Goal of this work is to determine electrical and photoelectrical properties as are electric conductivity, mobility of the free charge carriers, work function of the electrons and diffusion length of excitons. Conductivity was obtained through current and voltage contacts, mobility was measured by CELIV method (charge extraction by linearly increasing voltage). To determine work function a Kelvin probe was built and utilized. Diffusion length of excitons was determined from photovoltage spectrum formed by illuminating space charge region of the polymer.Space charge region on surface of the polymer can arise spontaneously or by laying suitable contact electrode. Powered by TCPDF (www.tcpdf.org)
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Influence of a complex stretching exercise of lower limb on postural stability
Maier, Ludvík ; Žáková, Lenka (advisor) ; Vomáčková, Helena (referee)
Title: Influence of a complex stretching exercise of lower limb on postural stability Objectives:: The main objective of this diploma these is to find out, using dynamic computerized posturography, whether the increased mobility of the lower limbs has a positive influence on postural stability. Another partial objective is to determine efficiency of the practised stretching exercises. Methods: This is a pilot study where in research participated five probands whose measurement results were evaluated qualitatively. The aged of probands at the time of the first measurement was from 13 to 18 years. All probands are male volleyball league players and during the last two years occurred to a marked grow by all of them. Given their tall stature, it was expected a decrease in the mobility of the lower limbs and muscle shortening. To the data acquisition was used clinical examination of active range of motion and shortened muscle testing according to Janda. Postural stability was measured using computerized dynamic posturography SMART EquiTest System from Neurocom. Measured data were processed using the program NeuroCom Balance Manager software. In the Framework of study were conducted two intrumental measurements in the range of two months. After the first measurement all probands were instructed how to...
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Properties of solar cells based on polymer-silicon junction
Pavlovič, Dean ; Toušek, Jiří (advisor) ; Křivka, Ivo (referee)
Title: Properties of solar cells based on polymer-silicon junction Author: Dean Pavlovič Department / Institute: Department of Macromolecular Physics Supervisor of the bachelor thesis: doc. RNDr. Jiří Toušek, CSc, Department of Macromolecular physics Abstract: The aim of this work is to study unconventional materials, namely conjugated polymers, as to be used for photovoltaic purposes. Among these polymers are polyaniline, derivative of polyphenylene vinylene and two derivatives of polythiophene. Four different methods are used to study some of the physical quantities of the samples, that should affect overall efficiency of solar power conversion. Firstly, I-V characteristics yields fill factor and indicates mechanism of charge transport. Method based on surface photovoltage (SPV) estimates diffusion length of the charge carriers - excitons. Impedance spectroscopy and particular method abbreviated CELIV both measure charge carrier mobility. Outcome of this work are the values of these quantities for some of the samples. Keywords: organic semiconductors, solar cells, mobility, diffusion length, current-voltage characteristic
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Warm up in ice hockey
Arnošt, Daniel ; Jebavý, Radim (advisor) ; Vojta, Zdeněk (referee)
Title: Warming up for ice hockey Objectives: The aim of these bachelor theses is to create a survey about warm up for ice hockey. Based on a survey, study of specialized literature and consultation with selected trainers I suggest a battery of exercises on a selected part of self-myofascial release with selected tools (foam rollers, balls). Methods: For the purpose of this bachelor thesis a quantitative scientific method was used. The data was obtained using the poll method. Data has been embedded in Excel. From these data, tables and charts were created. Results: Players spend longer time before the game than before training. Next results have confirmed that players have knowledge of mobilization, activation and self-myofascial release exercises. They use specific tools - foam rollers, resistance bands and balls. I create a battery of exercises for self-myofascial release. Keywords: ice hockey, warming up, foam roller, mobility, SMR
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