Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Investigation of the effect of composite patch repair on the life of a plate with two lateral cracks
(Techno-Press, 2025) Abdelmadjid, Moulgada; Sallah, Zagane Mohammed El; Djafar, Ait Kaci; Abderahmane, Sahli; Yaylacı, Murat; Mirzaloglu, Irem; Yaylacı, Ecren Uzun
This paper presents a study on the effect of composite patch repair on the fatigue life of an aluminum alloy plate containing two lateral cracks and subjected to cyclic tensile stresses applied to its upper and lower parts. The investigation considers several parameters, including the load ratio between minimum and maximum stresses (0, 0.3, 0.6, and 0.7), the cracking speed as a function of the stress intensity factor (Delta K), and the influence of the plate material. Among the alloys examined were 2024-T3, 2024-T351, and 7075-T73. The study identifies the material most resistant to cyclic loading. The plate is analyzed in both unrepaired and repaired conditions, with repairs performed using two different composite patches: boron/epoxy and graphite/epoxy. The results demonstrate that patch reinforcement significantly improves fatigue resistance, with boron/epoxy patches providing the greatest enhancement. The study concluded that the AL 2024-T3 material presents better results compared to the other two materials. These findings confirm the effectiveness of composite patching as a promising technique for extending the service life of cracked structures.
A systematic review of microplastic contamination in tuna species: general pathways into the food chain with ecotoxicological and human health perspectives
(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Peivasteh-roudsari, Leila; Javanmardi, Fardin; Shavali Gilani, Parisa; Tajdar-oranj, Behrouz; Doost, Zohreh Safayi; Yazdanbakhsh, Hananeh; Başaran, Burhan
Tuna species, as highly migratory apex predators of major commercial significance, play a vital role as biological indicators of microplastics (MPs) contamination due to their trophic position and wide geographic distribution. Current systematic review aims to analyze the occurrence, characteristics, and concentrations of MPs in various tuna species. Data from 19 studies were compiled, focusing on the presence of MPs in different organs (gills, muscles, gastrointestinal tracts). High concentrations of MPs were found in tuna species from the Bay of Bengal (42.13 +/- 13.58 MPs/individual in Thunnus obesus) and the Persian Gulf (5.71 MPs/individual in Thunnus tonggol), indicating significant contamination in these regions. Polyethylene (PE) and Polypropylene (PP) were the most commonly detected polymers, suggesting their widespread presence in marine environments. The dominant size range of MPs was 0.5-2.5 mm, with fibers and fragments being the most common shapes. The presence of MPs in edible tissues raises concerns about potential health risks for both marine life and human consumers. Future research should focus on expanding geographical coverage and investigating the ecological and health impacts of MPs ingestion. Long-term monitoring and international collaboration are essential to address this global environmental challenge effectively.
Long-term outcomes following radiation therapy for optic nerve sheath meningioma: a single-center experience
(Elsevier, 2025) Yılmaz, Tuğba; Marsiglia, M.; Wu, F.; Niemierko, A.; Marciscano, A. E; Bussiere, M. R.; Oh, K. S.; Shih, H. A
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Economic policy and environmental sustainability: analyzing macroeconomic determinants across the emission distribution in mediterranean countries
(Wiley, 2025) Çitil, Mücahit; Barut, Abdulkadir; Brika, Said Khalfa
This study examines the complex relationships between macroeconomic policies and environmental pollution in Mediterranean countries through the lens of quantile regression analysis. Drawing on panel data from 19 Mediterranean nations spanning from 1990 to 2024, we investigate how fiscal, monetary, trade, and exchange rate policies affect CO2 emissions across different points in the pollution distribution. Our findings reveal significant heterogeneity in policy effects, with explanatory power increasing substantially from lower to higher emission quantiles. Fiscal constraints, represented by public debt levels, demonstrate increasingly positive associations with pollution as emission levels rise. Monetary policy instruments show varying effects, with interest rates positively associated with emissions particularly among high polluters, while credit expansion exhibits a transition from negative to positive effects across the distribution. Trade openness consistently shows negative relationships with emissions, contradicting the pollution haven hypothesis for this region. Exchange rate appreciation is associated with higher emissions, with effects strengthening at upper quantiles. To address potential endogeneity concerns, we employ a two-stage quantile regression approach, which confirms these patterns while highlighting the critical roles of fossil fuel consumption and renewable energy in determining emission outcomes. The results underscore the importance of integrated policy approaches that account for differential effects across pollution levels and emphasize the need to incorporate environmental considerations into core macroeconomic policy frameworks. These findings contribute to our understanding of the macroeconomic–environmental nexus and offer insights for designing more effective environmental governance systems in the Mediterranean region.
Physicochemical, biochemical, and chemometric characterization of Oak Honey (Quercus spp.) From Kırklareli, Türkiye
(Wiley, 2025) Birinci, Ceren; Kemal, Mehmet; Kanbur, Esra Demir; Kara, Yakup; Erdem Özçelik, Ali; Kolaylı, Sevgi
Oak honey (Quercus spp.) is dark-colored honeydew and forest honey species with a high biological active capacity. This study investigated the chemical composition and antioxidant properties of oak honey produced in a limited area (K & imath;rklareli) in 2023. The physicochemical properties were typical for honeydew honey and were within the limits specified by the relevant legislation. The specific optical rotation (SOR) values were positive, and the average conductivity was 0.97 +/- 0.13 mS/cm. The average Hunter color L*a*b* values were 42.96 +/- 9.39, 34.39 +/- 3.17, and 70.81 +/- 13.66, respectively, and the honey samples were dark in color. The total fructose + glucose content ranged from 56.52 to 75.97 g/100 g, with a mean value of 66.80 +/- 6.20 g/100 g. The mean total phenolic and flavonoid content values were 48.74 +/- 11.19 mg GAE/100 g and 5.25 +/- 2.31 mg QUE/100 g, respectively. The major phenolic substances were ellagic acid and protocatechuic acid. Eight minerals were determined, K, Na, Mg, and Ca being the most abundant. The results showed that oak honey is rich in phenolic compounds and contains high levels of antioxidants and nutritional minerals. The high ellagic acid and potassium content in the region's oak honey can be important markers.
