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Forest Loss or Stability? A Binary Analysis of Land Cover in Ferizaj (1985–2025)
(University of Business and Technology, 2025) Zariqi P.
Forest cover mapping is used for characterizing environmental processes and for sustainable land use planning. This study monitored long-term forest cover changes for Ferizaj municipality (Kosova) from 1985 to 2025 through a binary classifier of non-forest versus forest. Multitemporal RapidEye images from the years 2014, 2020, 2022, and 2025 were processed through the Random Forest(RF) classifier of the Google Earth Engine (GEE), while the historical cadastral register was used for comparison for the year 1985. Performance of classification was measured based on accuracy indicators like Precision, Recall, F1-score, Balanced Accuracy, and 95% Confidence Intervals of Overall Accuracy. Performance was found to be high for all the years without exception, with F1-scores greater than 0.96 and Balanced Accuracy ranging from 94.8% to 99.0%. To discern temporal trends of change of forest cover, we employed the non-parametric Mann–Kendall trend test and Sen’s Slope Estimator through Python. It was observed that there existed a statistically significant downward trend (Z = −2.20, p = 0.027), which was characterised by a mean annual loss of approximately 0.35 km²/year. In total, the area of the forests was observed to reduce from 126 km² recorded in 1985 to 109.1 km² recorded in 2025, which represented a cumulative loss of nearly 17 km². These outcomes illustrate the importance of long-term monitoring to quantify deforestation and derive insight about landscape change. This integrated methodology of remote sensing, cadastral data, cloud processing, and statistical analysis forms a repeatable framework for assessing rapidly shifting land covers.
Design of a Harvester Head
Návrh harvestorové hlavy
(Czech Technical University in Prague, 2026-08-01) Findejs, David; Uhlíř, Roman; Hoidekr, Jan
The subject of this bachelor's thesis is a review of harvester heads, their currently available market solutions, and their main components. Furthermore, the thesis addresses the conceptual design of a harvester head, including a 3D model and assembly and component drafting documentation. Last but not least, the thesis contains structural calculations for selected critical components.
Experimental Verification of Selected Properties of Bolted Joints
Experimentální ověření vybraných vlastností šroubových spojů
(Czech Technical University in Prague, 2026-08-01) Stěpanov, Kirill; Kanaval, Jan; Češpíro, Zdeněk
This bachelor's thesis deals with the verification of the friction coefficient in the thread of a bolted joint. The theoretical part summarizes the basic knowledge about the production, materials, surface treatments and inspection and design of prestressed and non-prestressed bolted joints. The practical part is focused on the implementation of experimental measurements on a test site, including the processing and evaluation of the obtained results.
Draft Recommendations for Repairs of Used Cycloid Gearboxes
Návrh doporučení pro opravy použitých cykloidních převodovek
(Czech Technical University in Prague, 2026-08-01) Řáha, František; Kanaval, Jan; Lopot, František
This bachelor's thesis addresses cycloidal gearboxes on both a theoretical and practical level. The theoretical section describes the general operating principle, design, and internal force analysis of a cycloidal gearbox, with a specific focus on the cycloidal profile. This part provides a comprehensive overview of the mechanical properties of cycloidal drives and introduces the most prominent global and Czech manufacturers. The practical section focuses on the failure analysis of an FC-A15G-89 cycloidal gearbox supplied by PRAKAB Pražská kabelovna s.r.o. Subsequent disassembly revealed that the damage does not primarily affect the internal cycloidal mechanism itself, but rather typical components of common machinery, such as indentation of the input shaft keyway or damage to the gearbox housing. The following section specifies the repair and reassembly process of the supplied machine. Based on these findings, recommendations and guidelines for the disassembly, repair, and assembly of cycloidal gearboxes are presented in conclusion, which are transferable to other types of this machinery.
Effect of interpass cooling time on the microstructure of DED/WLAM deposits of Inconel 718 alloy
Vliv doby mezihousenkového ochlazování na mikrostrukturu DED/WLAM návarů ze slitiny Inconel 718
(Czech Technical University in Prague, 2026-07-24) Chudoba, Václav; Horník, Jakub; Sahul, Miroslav; Zýka, Jiří
This bachelor thesis evaluates the influence of interpass cooling time on the microstructural evolution, phase composition, and mechanical properties of Inconel 718 superalloy deposits manufactured via LMD-w additive manufacturing technology. The theoretical section provides a comprehensive overview of nickel-based superalloys, the physical-metallurgical principles of their strengthening mechanisms, wire-based laser directed energy deposition processes, and the mechanistic aspects of secondary phase precipitation and defect formation. In the experimental part, deposited structures prepared with variable interpass time delays are systematically analyzed. The characterization encompasses light and scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS) focusing on interdendritic segregation phenomena, and Vickers macro- and microhardness testing.