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Item type:Item, Access status: Metadata only , Hodnocení a charakterizace materiálu rentgenovou počítačovou tomografií(Vysoké učení technické v Brně. CEITEC VUT) Lázňovský, Jakub; Kaiser, Jozef; Pína, Ladislav; Adameyko, IgorRentgenová výpočetní tomografie (CT) je účinná nedestruktivní technika pro trojrozměrnou charakterizaci materiálů s rozlišením v mikro- a sub-mikro měřítku. Tato práce se zaměřuje na vývoj metod kvantitativní CT charakterizace a jejich aplikaci ve dvou oblastech: analýze biologických tkání a charakterizaci materiálů pro aditivní výrobu. V biologických aplikacích je využití CT demonstrováno pro odhad minerální hustoty kostí, hodnocení intervertebrální fúze u ex-vivo vzorků prasat, automatizovanou morfometrickou analýzu lebek myší a mapování vývoje modelového živočicha Xenopus laevis. V oblasti aditivní výroby je CT aplikováno při metodice stanovení prostorového rozlišení CT skenu, hodnocení prášků jako vstupního materiálu aditivní výroby a při víceúrovňové analýze referenčních, aditivně vyrobených vzorků. Společně demonstrované metodiky posouvají využití CT od vizualizační techniky k robustnímu nástroji pro nedestruktivní testování, a poskytují reprodukovatelné postupy, které nacházejí uplatnění jak ve vědeckém výzkumu, tak v průmyslové praxi.Item type:Item, Access status: Open Access , Complex Material Analysis of Reverse Painting on Glass by Means of Photography, Microscopy, and Spectroscopic Techniques(Wiley, 2025-10-01) Dumpíková, Markéta; Ivanova, Anastasiia; Kirchnerová, Romana; Zikmundová, Eva; Kelar Tučeková, Zlata; Pavliňák, David; Kučková, Štěpánka; Vyskočilová, GabrielaReverse paintings on glass are a group of specific artworks created in a reverse order with respect to conventional paintings. Their material research is particularly demanding because in many cases their dismantling is scarcely possible, limiting sampling and employing more sophisticated methods. Herein, different techniques ranging from noninvasive to destructive are employed in the investigation of two types, folk reverse paintings and reverse paintings with a metallic background. The potential of photography and digital microscopy observation is tested with the aim to help curators and restorers obtain as much information as possible without the need for expensive and hardly accessible analytical techniques. The acquired results were supported and, in some cases, clarified by scanning electron microscopy with energy-dispersive spectrometer analysis of the inorganic components, while organic components are studied by infrared (IR) spectroscopy and liquid chromatography-electrospray ionization-quadrupole time-of-flight mass spectrometry. The assessment of the different IR arrangements is also performed, suggesting the microattenuated total reflection Fourier transform infrared spectroscopy technique the most suitable for the analysis of reverse paintings on glass. The need for the utilization of complementary techniques is also demonstrated on the example of protein binder classification.Item type:Item, Access status: Open Access , Innovative air duct-enhanced thermal management and natural convection heat transfer intensification in the busbar compartment of an air-insulated medium-voltage switchgear(Elsevier, 2025-10-01) Novák, Ondřej; Klimeš, LubomírIn the current development of medium-voltage switchgear systems, there is a strong demand for increasing electrical efficiency, performance, and reliability, necessitating effective thermal management. However, there is only limited knowledge about the thermal behaviour and possibilities for cooling intensification of air-insulated medium-voltage switchgears, frequently used in practice. The study presents an innovative way to enhance the cooling of a busbar compartment of an air-insulated medium voltage switchgear. This comprised a thermally efficient design of air ducts for enhanced convection. Several designs were proposed and investigated. The investigations involved multi-physical computer simulations, experimental investigations, and testing, including standardised temperature rise tests. Good agreement between simulations and experiments was achieved with an average root mean squared error of about 2.8 degrees C. Shape-optimisation of the proposed design with a two-channel ventilation duct system led to a 57 % decrease in the pressure drop of the ducts, reducing the relative temperature rise in the busbar compartment by about 10 %- 25 % compared to other investigated designs. Such a superiority was also confirmed in experimental investigations in a certified laboratory. This makes the proposed design very promising for enhanced cooling and easy adaptation of the switchgear for various applications, including the increase in its current rating.Item type:Item, Access status: Open Access , Open Water Swimming: Swimmers’ Kinematical and Neuromuscular Characterisation in 5 km Swim(MDPI, 2025-10-01) Conceiço, Ana; Marinho, Daniel; Šťastný, Jan; Gonçalves, Carlos; Freitas, Joo; da Costa-Machado, Renato; Louro, HugoThis study aimed to characterize and analyse the kinematic parameters and muscle activity of swimmers in open water swimming (OWS). Nine male swimmers (age: 25.4 +/- 11.9 years; body mass: 75.9 +/- 9.0 kg; height: 180.7 +/- 6.7 cm; and arm span: 185.6 +/- 10.3 cm) were evaluated in an open environment (lake), performing 5 m x 1000 m at maximum intensity, with a rest of 30 s every 1000 m. For kinematical analyses, the stroke rate (SR), swimming velocity (v), stroke length (SL), and stroke index (SI) were calculated. Surface EMG data were recorded in seven muscles-upper trapezius (UP); latissimus dorsi (LD); pectoralis major (PM); posterior deltoid (PD); anterior deltoid (AD); triceps brachii (TB); and biceps brachii (BB)-for the underwater and recovery phases of the stroke. SL (F = 3.41, p = 0.06, eta 2 = 0.30) and SI (F = 3.29, p = 0.08, eta 2 = 0.29) changed along the covered distances, and SR (F = 1.54, p = 0.24, eta 2 = 0.16) increased, especially in the last 1000 m (32.5 +/- 3.0 cycles-min-1). AD was highly activated in recovery, showing statistical differences from the beginning (pItem type:Item, Access status: Open Access , Methodology of a flexible learning design enhancing the transition to university mathematics(University of Defence, 2025-12-15) Rebenda, JosefThe paper introduces a student-centred flexible learning design aimed at enhancing the transition to university mathematics, developed for the course Foundations of Mathematics at Brno University of Technology. We report on motivation, context, design and implementation of regular learning activities in a digital environment. The design is based on the combination of blended learning and peer feedback with a strong digital part. Illustrative examples are provided. The purpose is to give students more flexibility in their learning of mathematics and opportunity to improve their digital competences in a natural way.