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
A novel study on dielectric aspect of mortars about multi-binder structures consisting of divergent binders
(Elsevier, 2025) Çakmak, Talip; Murat, Caner; Ustabaş, İlker
Although there is a significant amount of CO2 emissions from cement, there are several innovative alternatives to reduce this amount. One of these is the utilize of pozzolanic materials alongside cement to diminish the mass of cement utilised. In that investigation, the mechanical, microstructural and dielectric aspects of mortar examples were investigated utilising discrete materials with pozzolanic properties as obsidian (OB), silica fume (SF), fly ash (FA) and granulated blast furnace slag (GGBS). Mortar specimens prepared with substitution proportions ranging from 0 % to 40 % were cured for 3, 7 and 28 days. The effects of the different materials on specific properties were characterised. According to the results obtained from the study, although the positive effects of pozzolanic materials were generally observed, the peak compressive strengths (CS) were acquired from the specimens including OB and SF. When the substitution rate exceeded a certain ratio, the compressive strengths decreased. It was clearly seen that there was a linear connection between the CSs and the results obtained from XRD, TGA and FTIR experiments. It was observed that the substitution of pozzolanic material made the structure of the mortars more compact and reduced the capillary voids and cracks. The scattering parameters of the original mortar specimens were evaluated at 6 GHz with a cube-shaped cavity resonator structure and converted into dielectric coefficient by the Nicolson Ross Weir Method. The dielectric coefficients of 3, 7 and 28 days old mortar examples were nonlinearly regressed with a fourth order power series and modelled having R2 values of 0.9994, 0.9995, and 0.9987, correspondingly. In this way, the proposed concrete content was measured quickly, practically and with high accuracy unlike traditional methods. The consequences of the research are assumed to encourage the utilize of pozzolanic materials in the production of mortars, specially in terms of mechanical and electrical properties.
Urban energy efficiency in China: Examining the role of renewable energy, smart Grids, and sustainable design through spatial and policy perspectives (1990–2022)
(Elsevier, 2025) Anser, Muhammad Khalid; Sajjad, Faiza; Nassani, Abdelmohsen A.; Al-Aiban, Khalid M.; Zaman, Khalid; Haffar, Mohamed
The study investigates urban energy efficiency in China from 1990 to 2022 via the perspectives of renewable energy, smart grids, sustainable architecture, and regulatory assistance using Sustainable Development Goals 7 (Affordable and Clean Energy) and 13 (Climate Action). Switching to renewable energy reduces carbon emissions (SDG-13) and boosts clean, inexpensive power (SDG-7). Smart grids (SDG-7) improve energy supply efficiency and reliability by integrating renewables and reducing energy waste. Making cities and infrastructure more energy efficient is Goal 7 of sustainable development to decrease emissions. Regulating these technologies and behaviors promotes widespread application and climate resilience (SDG-13) via policies and incentives. The study uncovers compelling insights by utilizing a robust methodology, specifically the Generalized Method of Moments. Renewable energy penetration (β = -1.479, p < 0.000), energy-efficient urban design (β = -1.816, p < 0.000), and public transportation adoption (β = -0.631, p < 0.028) exhibit negative correlations with urban energy efficiency. Conversely, implementing innovative grid technology (β = 2.386, p < 0.000) and utilizing building energy management systems (β = 0.337, p < 0.000) demonstrate positive impacts on urban energy efficiency. Exploration uses the impulse response function to predict future dynamics. Advanced grid integration is likely to reduce urban energy efficiency, while sustainable urban design is expected to improve it during the next decade. Variance decomposition study shows that renewable energy sources influence urban energy efficiency changes the greatest. After that, smart grid adoption, building energy efficiency, policy and regulatory assistance, and sustainable public transport decreased in importance. The results provide insights into greener city design, smarter grids, and increased use of renewable power sources in urban energy policy and practice. Energy-efficient and emission-reducing regulations may also improve sustainable urban development and climate resilience.
The role of tumor budding in early-stage laryngeal cancer treatment selection
(John Wiley and Sons Inc, 2025) Birinci, Mehmet; Gül, Oğuz; Okcu, Oğuzhan; Yemiş, Tuğba; Şen, Bayram; Çeliker, Metin; Öztürk, Çiğdem; Erdivanlı, Özlem Çelebi
Objective: Laryngeal cancer is a prevalent malignant neoplasm, with early-stage glottic tumors treated with surgery or radiotherapy. Radioresistance significantly complicates treatment, highlighting the necessity for early detection methods. This study aimed to evaluate the relationship between tumor budding and radiotherapy outcomes in affected patients. Methods: This investigation encompassed patients diagnosed with early-stage squamous cell carcinoma of the glottic larynx who received radiotherapy and had a minimum follow-up of 1 year. Pathological specimens collected at diagnosis were reassessed for tumor budding. The data were analyzed to determine the best cut-off value for tumor budding to predict radioresistance and differences in survival based on tumor budding cut-off value. Results: The study cohort comprised 49 patients who met the pre-established criteria. The radioresistant group comprised 14 patients. All except one patient were male (mean age: 64 years). The best cut-off value for tumor budding was determined as 2. Patients categorized into high risk (tumor budding ≥ 2) had a significantly higher chance of radiotherapy failure than those with low risk (tumor budding < 2, AUC = 0.696; p = 0.034; sensitivity = 78.6%; specificity = 62.9%). The high risk group also had a significantly reduced 5-year disease-free survival compared to the low risk group (p = 0.008). Overall survival was similar. Conclusion: The prognosis for early-stage glottic laryngeal cancer is generally favorable, yet a standardized risk stratification tool for treatment selection remains lacking. Tumor budding assessment in routine histopathology could help identify patients at higher risk of recurrence, guiding decisions on radiotherapy intensity and post-treatment surveillance. Integrating tumor budding into clinical practice may support more personalized treatment strategies, ultimately improving patient outcomes. Level of Evidence: 3.
Editorial: Mechanisms of stress tolerance in horticultural crops: physiological and molecular insights
(Frontiers Media SA, 2025) Lal, Milan Kumar; Kumar, Ravinder; Tiwari, Rahul Kumar; Kumar, Awadhesh; Ghorbani, Abazar; Pehlivan, Necla; Zargar, Meisam
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A comprehensive multicriteria assessment of frozen and cold storage systems on quality of benthic or pelagic fish
(John Wiley and Sons Inc, 2025) Alak, Gonca; Yavaş, Rabia Nur; Kara, Ayşe; Gelen, Sevda Urçar; Uçar, Arzu; Esenbuğa, Nurinisa; Chowdhury, Rasheda
Efforts to improve food safety on a global scale have become a topic of focus in recent years. Different preservation techniques, including new technological methods, are constantly being developed to keep products at physically, nutritionally, and microbially consumable levels and to prevent losses. In this study, the deep-freezing technique, which is widely used in the food industry, was applied to four marine fish species with different habitats and fat content (whiting [Merlangius merlangus], sea bass [Dicentrarchus labrax], red mullet [Mullus barbatus], and anchovy [Engraulis encrasicolus]). The study aimed to determine the effects of three-month storage period (−20°C) on some quality parameters (water activity [aw], water holding capacity [WHC], myofibril fragmentation index [MFI], color [L∗, a∗ and b∗], total volatile base nitrogen [TVB-N], thiobarbituric acid reactive substance [TBARS], and pH) in fish and the interactions between the main effects. The experiment design included two-way ANOVA to evaluate the influence of species, storage time, and their interaction on each parameter. In line with the data obtained, significant differences were detected among the fish for all parameters except TVB-N. In terms of storage time, all parameters except a∗, TBARS, and fat were found to be statistically significant. All interactions between fish type and storage time, except fat and TVB-N, were found to be significant. Notably, benthic fish species exhibited higher WHC and lower lipid oxidation compared to pelagic species. Fatty fish such as anchovy and red mullet showed increased TBARS levels, indicating greater susceptibility to lipid oxidation. MFI values varied significantly among species and storage times, with sea bass showing the highest degree of myofibrillar fragmentation, suggesting enhanced tenderness. Correlation analysis revealed that WHC positively correlated with aw, L∗, and MFI and negatively with TVB-N. The research findings were planned to fill important gaps regarding the effect of freezing technology on fillet quality according to fish species. The findings obtained in the current research constituted a modeling study and created a useful data library for elucidating the mechanism by which fish species and habitat may affect fillet quality. These results contribute to the development of species-specific freezing strategies and provide practical insights for improving frozen seafood quality in the food industry. Moreover, these results provide a strong motivation to further investigate fish species and habitats with different processing technologies in terms of fillet quality in food industries.
