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Item type:Item, Access status: Open Access , Mie-enhanced microfocused Brillouin light scattering for full wave vector resolution of nanoscale spin waves(American Association for the Advancement of Science, 2025-10-31) Krčma, Jakub; Wojewoda, Ondřej; Hrtoň, Martin; Holobrádek, Jakub; Arregi Uribeetxebarria, Jon Ander; Panda, Jaganandha; Pribytova, Ekaterina; Urbánek, MichalMagnons, the quanta of spin waves, are magnetic excitations of matter spanning through the entire crystal's Brillouin zone and covering a wide range of frequencies ranging from subgigahertz to terahertz. Magnons play a crucial role in many phenomena, such as the reduction of saturation magnetization with increasing temperature or the Bose-Einstein condensation. However, established experimental techniques cannot resolve magnons with wave vectors between 30 and 300 rad mu m-1. We address this gap by tailoring the Brillouin light scattering process with dielectric periodic nanostripes hosting Mie resonances. This approach enables access to the previously unmeasurable wave vector range while providing at the same time full wave vector resolution, all within a tabletop setup. Filling this gap can stimulate further experimental investigations of the fundamental phenomena associated with magnons as well as applications in computational and microwave devices. In addition, the same methodology can be applied to other excitations of matter, such as phonons, opening up possibilities in, e.g., mechanobiological studies.Item type:Item, Access status: Open Access , Water Supply in the Czech Republic: Review of Infrastructure Risks and Comparison with Worldwide Practices(MDPI, 2026-02-20) Horníček, Roman; Raclavský, JaroslavWater distribution systems (WDSs) are vital components of public infrastructure, ensuring the safe supply of drinking water. However, they are increasingly exposed to technical failures, contamination events, natural disasters, and cyberattacks. This review analyses global risks to water distribution systems (WDSs), focusing on biological, chemical, and cyber threats, and compares international approaches to detection, monitoring, and crisis management. Special attention is given to advanced technologies, such as sensors, digital modelling, and innovative disinfection methods, that enhance resilience and enable rapid contamination response. Case-based insights from the Czech Republic illustrate the strengths of a system with consistently high water quality standards while also revealing vulnerabilities linked to ageing infrastructure, limited digitalisation, and emerging risks related to climate change and cybersecurity. The review further highlights differences in international hygiene standards and regulatory frameworks and their implications for water safety. Future research priorities include: (I) predictive modelling and machine learning for contamination dynamics; (II) advanced disinfection combining UV, ozone, and nanomaterials; (III) systematic study of biofilms and microbial resistance; (IV) monitoring and risk assessment of pharmaceuticals, PFASs, and other emerging contaminants; (V) development of rapid, low-cost sensors and biosensors for real-time detection; and (VI) socio-technical studies addressing risk communication and public trust in drinking-water systems. Recommendations focus on systematic infrastructure renewal, enhanced monitoring and predictive modelling, and stronger integration of crisis preparedness and cybersecurity. Overall, the results underline the need for sustained investment, technological innovation, and cross-sector cooperation to ensure long-term water security.Item type:Item, Access status: Open Access , Thermal performance of automotive radiators made of plastic and stainless steel microtubes(Elsevier, 2026-02-01) Astrouski, Ilja; Boháček, Jan; Mráz, Kryštof; Horák, Aleš; Bartuli, ErikThe thermal performance of low-temperature radiators constructed from staggered banks of stainless steel microtubes (SST unit) and polymeric fibers (PF unit, polyamide 612) was investigated in air cross-flow conditions. Tests were performed in a calorimetric wind tunnel according to automotive standards with air velocities of 2-10 m/s and coolant flow rates of 6-60 l/min. Experimental results demonstrated that airside pressure drops for SST and PF radiators are nearly identical, with a difference of approximately 1 %, showing that tube material did not influence airside pressure drops. Regardless of the 50-time difference in thermal conductivity between stainless steel (12 W/(m & sdot;K)) and polyamide (0.24 W/(m & sdot;K)), the heat transfer rate of the PF radiator was, on average, only 7 % lower than ST, with smaller deviations observed at lower air velocities. The Gaddis and Gnielinski model showed good prediction, with average discrepancies of 3 % for heat transfer rate, 7 % for overall and airside heat transfer coefficients, and 5 % for pressure drops. The results confirm that, when middle buffers are used, polymeric hollow-fiber radiators can be a viable lightweight alternative to metals for low-to-moderate airflow applications (2-10 m/s air speed).Item type:Item, Access status: Open Access , Surface scan cold plasma technology for effective inhibition of Staphylococcus epidermidis and Escherichia coli(Springer Nature, 2026-01-19) Loupová, Veronika; Chobotská, Barbora; Menčík, Přemysl; Kozáková, Zdenka; Hrudka, Jan; Krčma, František; Trebulová, KristínaThis study examines the decontamination efficacy of cold atmospheric plasma (CAP) against Staphylococcus epidermidis and Escherichia coli, with emphasis on surface scanning parameters and resistance potential. Bacterial cultures on solid nutrient media were treated using a non-thermal microwave plasma torch operated with high-purity argon (4.6) at 5 Slm and 12–13 W. Treatment was systematically varied in scanning direction, speed, and duration. Results indicate that exposure time was the main factor influencing bacterial inhibition, whereas direction and speed exerted only minor effects. E. coli exhibited greater susceptibility compared to S.epidermidis. Repeated exposure experiments revealed no evidence of resistance development.Item type:Item, Access status: Open Access , Poznámky z aplikací Fourierovy analýzy(VUT v Brně, Fakulta strojního inženýrství, 2026-02-24) Druckmüllerová, Hana; Kalenská, PetraSkripta obsahují souhrn potřebné teorie (tzv. spojité) Fourierovy transformace a diskrétní Fourierovy transformace pro její využití při zpracování obrazů a pak tyto aplikace (především obrazové filtry a sesazování obrazů).