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Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2026Scopus SJRQ1/r/bayburt/12675
  Enhanced Absorption-Dominant EMI Shielding Performance of Pyramidal Cementitious Composites Incorporating Recycled Plastics and Magnetite Minerals for 5G Applications

  Cakir, Mehmet; Engin, Mustafa Alptekin; Camuzcuoglu, Murat

  In this study, waste polypropylene (PP) and magnetite (Fe3O4) mineral-reinforced cement-based pyramidal composite structures were designed, manufactured, and experimentally characterized to reduce electromagnetic interference (EMI) problems in the 3.3–4.9 GHz frequency band for 5G communication systems. Unlike traditional planar concrete surfaces, the aim was to minimize surface reflections and obtain an absorption-dominant shielding mechanism by providing gradient impedance matching through the pyramidal geometry. Although the use of carbon-based nanomaterials is common in the current literature, their high cost and corrosion risks limit their large-scale applications. This study involves the evaluation of waste polypropylene disposal and self-enriching magnetite mineral together. Theoretical analyses were supported by the Lichtenecker Logarithmic Mixing Rule and the Maxwell–Garnett model, and seven different mixing scenarios (S1–S7) were measured using the free-space method with a Libre vector network analyzer. Experimental results showed that the pure concrete sample exhibited predominantly reflective behaviour, with shielding performance improving significantly as the filler ratio increased. The S4 sample, containing 15% PP and 10% magnetite, offered broadband and balanced absorption performance, while the S7 sample, containing 25% PP and 25% magnetite, provided the highest shielding effectiveness with reflection below −10 dB across the entire band and transmission loss reaching −65 dB.

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• MakaleAçık Erişim2024/r/bayburt/15980
  Usability of calcite mineral, which develops in the crack fillings of carbonate rocks, as ornamental stone

  Camuzcuoğlu, Murat

  Turkey has a significant amount of mineral content from a geological perspective, offering essential resources, especially in mining (ornamental stone production). In this study, methods are being developed for the extraction, processing, and usability of calcite minerals, which develop as vein fillings (secondary formations) among fragmented limestone along the Bayburt-Erzurum highway for ornamental stone use. The chemical and crystallographic properties of the mineral were determined through XRD and FTIR analyses, and its suitability for ornamental stone use was evaluated. (durable, clean, and transparent) epoxy was used as a binding material for ornamental stone production, and the use of calcite minerals in jewelry production was examined, revealing its potential economic value in terms of durability, aesthetics, and rarity. Generally, while calcite minerals are widely used in various industrial fields, their use as ornamental stones remains limited. This study presents a new perspective on evaluating calcite minerals as ornamental stones, demonstrating the possibility of processing a low-hardness mineral as an ornamental stone using binding materials and its potential economic value. These findings significantly evaluate natural minerals in different applications and enhance their financial potential.

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