This research involves the synthesis of a hybrid composite by adding titanium carbide (TiC) and hexagonal boron nitride (hBN) powders in certain weight ratios (2.5–5%) to pure aluminum (Al) powder. When previous studies were examined, it was seen that TiC and hBN powders were added separately to Al matrix powders; however, a hybrid composite was not produced as in this study. The obtained hybrid composites were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and X-ray diffraction (XRD) analysis. Microstructure, hardness and wear tests were carried out under 3 different loads (10 N, 20 N and 30 N) and dry conditions. Weight loss and coefficient of friction measurements were obtained for each hybrid composite during the wear tests. The TiC–hBN-reinforced specimen exhibited a significantly higher hardness value of 37.08% compared to the pure Al composite. It was also found that the synthesized Al–TiC–hBN hybrid composite exhibited a 59% reduction in the wear loss value for 10 N load, 30% for 20 N load and 60% for 30 N load compared to the pure Al sample. It is believed that the hybrid composites produced in this study have the ability to compete with Al matrix materials and exhibit the potential for longer durability and cost reduction in industries that use the production of aluminum parts.

Unmanned Aerial Vehicles are electronic systems that are used extensively in every field today and that develop and change very quickly with technology. UAVs are used extensively in many areas, especially in logistics processes, search and rescue activities, military operations, fight to forest fires, photography, monitoring and inspection of agricultural processes. Furthermore, considering their hobby use, it is understood that UAVs have a large commercial market and a high economic value. UAV systems contain many electronic and mechanical systems and many performance criteria can be found for UAV systems. The main ones of these performances are stabilization and engine power. The most important system affecting these performance criteria is the engine. In this study, engine alternatives available in the market for UAVs with take-off weights of 750 to 800 grams were evaluated in terms of mechanical and physical criteria of engine systems, and as a result, the ideal engine model was determined by Analytical Hierarchy method for maximum stabilization and velocity purposes. The article is the first in the literature in terms of the problem obtained and the application of the AHP method to this problem. Thanks to the study, it is aimed to create a Decision Support System for both UAV manufacturers and UAV users so that they can choose the ideal models in engine selection processes.

In this study, pure and hBN-doped ZnO nanoparticles were synthesized by sol–gel method. ZnO–hBN nanoparticles were mixed with pure aluminum powders and samples were prepared using powder metallurgy processing parameters. It was observed that Al, ZnO, and hBN nanocomposite particles formed homogeneously. With the addition of ZnO–hBN, significant changes occurred in hardness, wear, and friction coefficient values compared to pure Al samples. The highest hardness value in the samples is mesh. It was obtained as 105 HB in 10 wt.% hBN added sample. In the wear tests, it is seen that the wear resistance is seven times higher in the 1 wt.% hBN added sample compared to the pure Al sample, while the friction coefficient decreases with the increase of the hBN additive.

Rotary-wing nano-quadcopters are unmanned technologies used for reconnaissance and surveillance operations in many areas, especially strategic missions such as security and military operations. The main problem for these devices, which reached a wide audience with the widespread use of civilian production, is stabilization. The most important parameter affecting the stable, effective and reliable flight of these UAVs in the air is PID elements. In this study, experimental studies are carried out in [x, y, z] coordinates using a programmable Nano-quadcopter Crazyflie 2.0 drone. In order to determine the relationship between stabilization and PID control parameters of these systems, each coordinate axis is analyzed statistically. As far as is known, there is no study in the literature regarding the performance of the PID parameters of the Crazyflie 2.0 drone. At the end of the analysis study with the SPSS program, it is determined that the related drone moves with a very high level of efficiency in the "z" axis and performs the task related to the high level of efficiency on the y-axis. It is also confirmed that the drone performs poorly in the stabilization movement on the "x" axis and as a result of the analysis study, the system becomes more stable by making the necessary adjustments in the "yaw_p" parameter. Thanks to the study, it is aimed to create a decision support system for the optimization of the PID control parameters of UAVs, which are used extensively in every sector.

İçten yanmalı motorlarda alternatif yakıt arayışları uzun yıllardır araştırmaların yoğunlaştığı konulardan birisini oluşturmaktadır. Bu çalışma kapsamında, dizel bir motorda atık taşıt lastiklerinden (ATL) elde edilmiş pirolitik yağın (PY) yanma karakteristikleri ve egzoz emisyonlarına etkileri üzerine bir araştırma yürütülmüştür. ATL piroliz yöntemiyle üretilmiş ve hazır olarak temin edilmiştir. Bu amaçla, 4 zamanlı 4 silindirli 1.9 litre hacmine sahip, multijet bir dizel motor üzerinde deneysel bir araştırma gerçekleştirilmiştir. Çalışmada, dizel yakıtı ve %20 karışım oranlarında benzin B20(%80 dizel + %20 benzin) ve pirolitik yağ P20(%80 dizel + %20 pirolitik yağı) yakıt olarak kullanılmıştır. Bu çalışmada benzin ve pirolitik yağ kıyaslanarak dizel motorlarda uygulanan çift yakıt metodunda, benzine alternatif bir alternatif yakıt araştırması yürütülmüştür. Çalışmada, maksimum motor momentinin %25 kadar bir motor yükü sabit tutularak değişen motor devirlerinde araştırma yürütülmüştür. Elde edilen verilere göre kullanılan yakıtların motor yakıt sisteminde bir revizyon gerektirmeden kullanılabileceği gösterilirken, gelişmiş yanma stratejileri için bir bakış açısı ortaya konulmuştur. Özelikle P20 yakıtı kullanımında özgül yakıt tüketimi ve termal verimde iyileşme gözlenmiştir. Ayrıca B20 ve P20 kullanımları ile HC emisyonlarının kontrolüne dair umut verici sonuçlar elde edilmiştir. Sonuç olarak, mevcut çalışmada kullanılan ATL’den üretilmiş PY’nin dizel motorda alternatif yakıt olarak kullanılabileceği gözlemlenmiştir.