Van Yüzüncü Yıl University Research Information System
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MULTI-CRITERIA SUSTAINABILITY PERFORMANCE ANALYSISOF COMMERCIAL BANKS IN TÜRKİYE BASED ON MPSI ANDRAWEC METHODS
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Numerical Investigation of Repeated Impact Ballistic Performance of High-Hardness ARMOX 600T Steel Against 0.3-Caliber FSP
No full textAbstract In this study, the ballistic response of high-hardness ARMOX 600T armor steel under repeated impacts of 0.3 caliber Fragment Simulating Projectiles (FSP) was numerically investigated. ARMOX 600T, with a Brinell hardness of approximately 600 HB, is widely used in heavy armor applications due to its excellent combination of hardness and impact resistance. It is particularly preferred in armored vehicle structures and fixed protection systems where high levels of ballistic protection are required. Numerical simulations were conducted using the ABAQUS/Explicit finite element software, and the material behavior was defined using the Johnson–Cook strength and damage model. Three successive impacts were applied to the same location of 5 mm thick ARMOX 600T plates at velocities of 500 m/s, 750 m/s, and 1000 m/s. The study comprehensively examined the deformation geometries and stress distributions of both the projectile and the armor plate. The results revealed that projectile velocity and the number of impacts play a critical role in maintaining the structural integrity of high-hardness steel armors subjected to repeated ballistic loads. In this context, the findings provide valuable insights for armor designers and researchers evaluating ballistic performance under multiple-hit scenarios.Abstract In this study, the ballistic response of high-hardness ARMOX 600T armor steel under repeated impacts of 0.3 caliber Fragment Simulating Projectiles (FSP) was numerically investigated. ARMOX 600T, with a Brinell hardness of approximately 600 HB, is widely used in heavy armor applications due to its excellent combination of hardness and impact resistance. It is particularly preferred in armored vehicle structures and fixed protection systems where high levels of ballistic protection are required. Numerical simulations were conducted using the ABAQUS/Explicit finite element software, and the material behavior was defined using the Johnson–Cook strength and damage model. Three successive impacts were applied to the same location of 5 mm thick ARMOX 600T plates at velocities of 500 m/s, 750 m/s, and 1000 m/s. The study comprehensively examined the deformation geometries and stress distributions of both the projectile and the armor plate. The results revealed that projectile velocity and the number of impacts play a critical role in maintaining the structural integrity of high-hardness steel armors subjected to repeated ballistic loads. In this context, the findings provide valuable insights for armor designers and researchers evaluating ballistic performance under multiple-hit scenarios.</div
Examining the effects of different seismic base isolators on the seismic behavior of a real-size steel truss structure
No full textIn this study, the seismic behavior of a real-size steel truss structure is examined for elastomeric isolator, double friction pendulum isolator, and fixed support conditions. Hence, the main aim of the study is to examine which type of support is safer for seismic response of a real-size steel truss structure, considering the structural reactions under earthquake and other acting load effects. To do this, the structural models generated with three different support conditions are examined in detail in terms of earthquake characteristic according to conducted structural seismic analyzes. The real-size steel truss structures are modeled in SAP2000 structural analysis program and are designed in accordance with the Turkish Building Earthquake Code-2018 specifications. The snow and wind loads acting on the truss structures are calculated in the direction of TS EN 1991-1-3 and TS EN 1991-1-4 specifications, respectively. The earthquake forces are implemented to the truss structure through mode superposition method. Finally, the truss structure is comparatively examined in terms of the structural weight, base shear force, natural vibration period, and relative drift. As regards to the obtained results, it has been observed that the seismic responses of the steel truss structure are remarkable better when the seismic base isolator is implemented into the structure
A comparative analysis of land use classification methods using Landsat and ancillary data in urban mapping
No full textThis study compares the performance of parametric (LDA) and non-parametric (CTA, RF, SVM) classification algorithms in mapping urban and surrounding land cover types in Balikesir, Türkiye, using Landsat 8 OLI/TIRS imagery and ancillary data. Seven land cover classes—built-up areas, roads, water bodies, forests, meadows, agriculture, and barren land—were classified based on 2,480 ground truth points. The Random Forest (RF) classifier achieved the highest overall classification accuracy (Kappa = 0.90) and an F1-score of 0.99 for the built-up class, outperforming LDA (Kappa = 0.86), SVM (0.83), and CTA (0.78). The integration of the Digital Elevation Model (DEM) with spectral wavebands improved classification performance, particularly in distinguishing urban areas from spectrally similar classes such as barren land and roads. In contrast, additional indices like NDBI and SAVI provided only marginal improvements. Results suggest that incorporating DEM enhances model robustness and spatial accuracy, while the sole use of ancillary indices may introduce redundancy. The study underscores the importance of selecting appropriate classifier–data combinations and highlights the utility of the F1-score, alongside Kappa, for evaluating class-specific accuracy. This research contributes to urban land cover mapping by offering a comparative framework that integrates ancillary variables, helping to refine classification strategies in heterogeneous landscapes
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No full textMetal–Organic Framework MIL-101 as an Efficient Heterogeneous Catalyst for Clean Synthesis of Benzothiazoles and Single Crystal X-ray Diffraction, Quantum Chemical Studies, Electrochemical Performance, Molecular Docking and DNA Interactions
No full textBenzothiazoles have emerged as a prominent area of research in recent years due to their broad spectrum of biological activities. These heterocyclic compounds, which contain thiazole and benzene rings in their molecular structure, exhibit a wide range of pharmacological effects, including anticancer, antimicrobial, antifungal, antiparasitic, anti-inflammatory, and antitubercular activities. In this study, benzo[d]thiazole derivatives 1 and 2 were synthesized in good yield using catalyst MIL101. The structures of these compounds were analyzed using elemental analysis, IR, 1H, 13C NMR and single crystal X-ray diffraction. The quantum chemical calculations of these compounds were performed density functional theory method, DGDZVP base set and B3LYP functions with Gaussian09W software package. The electrochemical properties of these compounds were investigated by cyclic voltammetry technique on a glassy carbon electrode. In addition, the interactions of the compounds with DNA were investigated by electrochemical, spectrophotometric and molecular docking techniques. It was observed that the chemical calculations and molecular docking results were compatible with each other
