Student EEICT 2022: Selected Papers

Title: Proceedings II of the 28th Conference STUDENT EEICT 2022
Subtitle: Selected Papers

Publisher: Brno University of Technology, Faculty of Electrical Engineering and Communication
Supervisor: Prof. Vladimír Aubrecht
Editor: Assoc. Prof. Vítezslav Novák
Place and year: Brno, 2022

ISBN: 978-80-214-6030-0
ISSN: 2788-1334
https://www.eeict.cz/

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Recent Submissions

Now showing 1 - 5 of 66
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    Design of a micromanipulator for repairs of printed circuit boards
    (Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Kopřiva, Pavel; Otáhal, Alexandr
    This work deals with design of micromanipulator based on pantographic mechanism with electronic control. The main purpose of this micromanipulator is repairing printed circuit boards, but it has been designed to be universal for any use case. The main focus is on creating device that will have the highest possible accuracy, while still being able to provide necessary force to carry out mechanical repairs of printed circuit boards. The work contains the design of the pantographic mechanism, stepper motor based electrical drive section and control circuits with power supplies.
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    A Separation and Characteristics of Inner Egg Shell Membrane
    (Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Charvot, Jakub
    The aim of this work is to characterize inner egg shell membrane (IESM) and compare different methods of extracting it from an egg. Scanning electron microscopy (SEM) was used in a combination with energy dispersive X-Ray spectroscopy (EDX) to get an idea of membrane structure and chemical composition and impacts of the used extraction method. Significant differences were found between the measured samples, but it has not been verified whether they affect the resulting physical properties yet. The importance of this study lies mainly in the future investigation of several factors, such as piezoelectric properties, so it serves as a fundamental research.
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    Numerical Modelling of Hypersonic Flow of Spacecrafts
    (Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Mačák, Martin; Vyroubal, Petr
    Numerical simulations of rarefied gas flows are an important area in the design of aerospace vehicles. They can provide a suitable alternative to experiments, which can be often too complicated due to extreme conditions. Navier-Stokes equations, which describe continuum fluid flow, generally lose their applicability in low pressures. As a result, it is necessary to adjust these equations or use alternative models. This article studies the possibility of using a continuum numerical model for a simulation of a hypersonic flow of a reentry module. Based on the Knudsen number, it was shown that it is still possible to use Navier-Stokes equations either without any adjustments or with the addition of a slip flow boundary condition.
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    Effect Of Al2O3 Barrier On The Field Emission Properties Of Tungsten Single-Tip Field Emitters
    (Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Burda, Daniel; Knápek, Alexandr
    This research aims to obtain a more in-depth understanding of the field emission properties of tungsten single-tip field emitters (STFEs) coated with a several tens of nanometer thin barrier of Al2O3. The introduction of an additional barrier into the metal-vacuum interface system of the emitter can be beneficial to improve its performance. The tungsten emitters were prepared using a two-step electrochemical drop-off etching technique. Thin oxide barrier coatings were prepared by using low-temperature atomic layer deposition (ALD), a chemical vapor deposition technique. Field emission was studied in an internally developed field emission microscope (FEM) working in UHV vacuum (< 1·10−7 Pa), and the experimental field emission data were analyzed by the so-called Murphy-Good plotsThe value of the local work function of the grown oxide layer were investigated using Ultra-violet photoelectron spectroscopy (UPS).
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    Low-Level Measurements
    (Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2022) Zdražil, Lukáš; Roubal, Zdeněk
    This paper deals with the measurement of low values of electrical voltages and currents from sources with high internal resistance. The measured values are close to the theoretical limits of achievable sensitivity, which are determined by the magnitude of the Johnson´s thermal noise. Non-thermal noises are also generated in the circuit. The most significant noise after Johnson´s thermal noise is flicker noise with a frequency dependence of 1/f. Choosing an accurate operational amplifier with low input bias and noise is just as important as choosing precise passive components with low noise.