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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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Uncertainties of measurements of temperature
Staněk, Vladimír ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This work deals with various methods of temperature measurement and uncertainties of the measurements. The work is well-arranged the principles of temperature sensors. Under each of these sensors is this work subsequently divided into chapters, such as metal resistance, resistance semiconductor, monolithic PN, thermoelectric, expansion, special, and proximity sensors indicating temperatures. The next chapter also describes the calculation of the direct measurement uncertainties and practical example is shown in the measurement of temperatures in which the counting uncertainty.
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Usage of internet access to laboratory instrumentation
Pešina, Tomáš ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
Content of this work is oriented on usage of remote access over internet to measure on laboratory instruments. Deals with standards of connection measuring devices. Engaged into LXI standard, instalation of necessary accessories of hardware and software and ways which is possible to control measuring devices. Studies principle and benefits of using standard LXI. In practical part of this work is creating material oriented laboratory themes, by help of programme environment VeePro, chosen from themes of bachelor´s study program.
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Monitoring properties of nanocomposites on base epoxy
Libra, Miroslav ; Rozsívalová, Zdenka (referee) ; Polsterová, Helena (advisor)
The present thesis deals with the study of nanotechnology in the field of composite materials (nanocomposites). Furthermore, the production, composition and electrical properties of these materials. Samples for the experiment are made of epoxy resin as matrix and titanium dioxide TiO2 as fillers with different benefits. Are the measurements the temperature dependence of permittivity, loss factor and internal resistivity.
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Influence of correction factors on the parts of complex permittivity
Hangya, Josef ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This work consider with monitoring components of complex permittivity at frequency section under the action of alternating electric field. Further factors, affecting the final accuracy of measured values. Object of this experiment is crystalline high-density polystyrene QUINN PS (thickness 2, 3 and 6 millimeters), at which according to the type of electrode system, follow the influence of air gap at the interface electrode - material. The experiment is finally finished with a test report according to standards IEC 250.
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Minimizing errors in measuring ultra low currents
Maule, Radek ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This work describes the methodology of measuring ultra low currents of the order of 10-8-10-14 [A] and the errors that arise during the measurement. This work is focused on electrical conductivity of insulation materials and interfaces electrode - dielectric during charging and discharging of the sample which is located in the ideal workplace.
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Electrical properties of modified oligobutadienes
Toulová, Jana ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
Bachelor thesis deals with the behavior of dielectric materials in an alternating electric field. To identify the properties of dielectric materials in the frequency domain method was employed dielectric relaxation spectroscopy. On several samples of modified oligobutadiénů were measured frequency dependent components of the complex permittivity in the temperature range of negative temperatures, the ambient temperature.
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