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Item type:Item, Access status: Open Access , Sustainable Micromobility in Cities: Optimization of Shared Bicycles(Elsevier, 2026-03-01) Eryganov, Ivan; Nevrlý, Vlastimír; Pluskal, Jaroslav; Šomplák, RadovanEnsuring mobility and transportation services is a key factor for economic growth today. Urban public transportation cannot fully meet individual needs, which led to the introduction of shared transportation options. These systems allow for more flexible mobility, but challenges are still associated with the efficiency of provided services. Tasks such as regular maintenance and relocation between stations are often carried out by workers’ experiences, leading to inefficient route planning and imbalanced stations. Analyzing the current bike-sharing operations and optimizing transport and management can contribute to more efficient worker routes and increase bike rentals. This research focuses on planning rebalancing and maintenance routes while considering various criteria. This approach makes it possible to prioritize different tasks or locations and uncertainties in demand. The main criterion is to ensure the sustainability and efficiency of the whole operation chain. The solution is obtained from a custom-designed algorithm explicitly tailored to this problem. The proposed approach should contribute to optimizing the daily routine of workers, ensuring greater availability of shared transportation options. The model and the corresponding algorithm have been verified using real data from a commercial bike-sharing system in one of the cities of the Czech Republic. The results demonstrate that operators contribute to approximately 10 to 20% of the satisfied demand.Item type:Item, Access status: Open Access , Cretaceous granites-possible source of the Carpathian gravity low(Elsevier, 2026-01-21) Pospíšil, Lubomil; Bartoněk, Dalibor; Bureš, JiříThe Carpathian gravity low is one of the most discussed geophysical problems in the area of the Western Carpathians. The source of this regional anomaly has been debated since the 1980s. The ideas of individual authors were based on the powerful sedimentary layers in the bedrock of the flysch and Central Western Carpathians or on the effect of the source at the level of the Moho discontinuity. In 1980, the first interpretation appeared, when the authors connected the source with the presence of granitoid masses. In the course of time, individual unrealistic ideas about the influence of molassoid sediments or deep structures were gradually excluded. The work provides new interpretations based on integrated seismic, magnetotelluric (MT), and gravity data, and its conclusions are supported by the presented data and models - with limited quantitative uncertainty analysis. The study advances understanding of the Western Carpathians' crustal structure and offers a plausible geological explanation that refines long-debated hypotheses about the gravity anomaly. The results gained on the bases of the reinterpretation of gravity, magnetic, reflection seismic and magnetotelluric data (MT) confirmed the existence of an environment that can be explained by the presence of granites based on the absence of significant reflexes and the presence of high-resistivity horizons in the Low Tatras area. In this paper, compared to other similar works, a model is presented that assumes the presence of Cretaceous granitoid complexes. It is based on a comparison with a similar gravity effect manifested in the Rochovce area. Cretaceous granites drilled here proved the presence of such complexes in the subsoil in the Tatric and Veporic units. From paleographic studies, it is possible to find a connection with similar bodies of Cretaceous granites (banatites) located in the range from the Apusena Mountains to the South Carpathians.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).