Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(110)
- Güler, Ömer(70)
- Akkurt, Nevzat(69)
- Serdar, Osman(57)
- Yucesan, Melih(55)
- Celik, Erkan(53)
- Tekin, H.O.(52)
- ALMisned, Ghada(49)
- Bulut, Hasan(49)
- Baskonus, Haci Mehmet(48)
- Paksoy, Mehmet Yavuz(46)
- Yildirim, Numan(45)
- Kocabaş, Mehmet(41)
- Yildirim, Nuran Cikcikoglu(41)
- Zengin, Gokhan(40)
- Alataş, Mevlüt(39)
- Ince, Muharrem(38)
- Benzer, Fulya(37)
- Mete, Suleyman(34)
- Aslan, Naim(33)
- Kutlu, Banu(33)
- Yildirim, Ozal(33)
- Topal, Murat(32)
- Tanyol, Mehtap(30)
- Batan, Nevzat(28)
- Özkul, İskender(28)
- Kök, Mediha(27)
- Utku, Anıl(27)
- Can, Erkan(26)
- Danabas, Durali(26)
- Sulaiman, Tukur Abdulkadir(26)
- Ates, Mehmet(25)
- Ezer, Tülay(25)
- Guler, Omer(25)
- Kutluyer, Filiz(25)
- Say, Yakup(25)
- Serin, Faruk(25)
- Erguven, Gokhan Onder(24)
- Onat, Onur(24)
- Cakilcioglu, Ugur(23)
Yayınlar
- MakaleYalnız künye2027Scopus SJRQ2Design, structural characterization, and simulated radiation-transport assessment of high-entropy (GdErSmEuYb)2X2O7 (X = Hf, Zr, Ce, Si) rare-earth oxides
Güler, Ömer; Güler, Seval Hale; Yayla, Nihal; Baykal, Duygu Sen; Durmus, Hasan; Tekin, Huseyin Ozan; ALMisned, Ghada
This study investigates the structural, microstructural, surface-chemical, and radiation attenuation behaviour of high-entropy rare-earth oxide (HEO) powder compositions synthesized as TBC-related candidate coating materials, whose radiation attenuation potential was assessed within a computational Inconel-718-based sandwich model. Four compositions, namely (GdErSmEuYb)2Hf2O7, (GdErSmEuYb)2Ce2O7, (GdErSmEuYb)2Zr2O7, and (GdErSmEuYb)2Si2O7, were synthesized via high-energy ball milling followed by calcination at 1200 °C. X-ray diffraction results revealed the formation of distinct crystal structures depending on B-site chemistry, including defective fluorite and silicate-type phases. SEM-EDS mapping confirmed homogeneous elemental distribution, while XPS analysis demonstrated mixed valence states and different oxygen vacancy concentrations across the compositions. To evaluate radiation attenuation performance, a sandwich-type geometry consisting of a 10 mm Inconel-718 core with symmetrically defined simulated HEO layers was modelled using Monte Carlo simulations. Gamma-ray transmission was analyzed over an energy range of 0.276-1.332 MeV, and fast neutron attenuation was assessed at 4.5 MeV. The results showed that transmission factors decreased with increasing coating thickness, with the effect being more pronounced at lower photon energies. Among the investigated compositions, the Hf-based system exhibited the most favorable predicted attenuation response for both gamma rays and fast neutrons under the defined simulation conditions. Theoretical half-value layer calculations also showed good agreement with the simulation results. Overall, the findings indicate that high-entropy rare-earth oxide coatings may provide an additional radiation attenuation contribution when incorporated as layers in Inconel-718-based systems. However, since direct thermal-barrier properties such as thermal conductivity, thermal diffusivity, thermal cycling resistance, and thermal-stress behavior were not evaluated in the present work, the present study should be interpreted as a structural and radiation-transport assessment of TBC-related coating candidates rather than a direct demonstration of thermal-barrier performance.
- MakaleAçık Erişim2026Effect of Temperature on the Fracture Characteristics of Hot Mix Asphalt Mixtures Using the Semi-Circular Bend (SCB) Test
Ince, Ragip; Furtana, Beyza; Yılmaz, Mehmet
This study investigates the temperature-dependent fracture behavior of hot mix asphalt using the Semi-Circular Bend (SCB) test and nonlinear fracture mechanics principles. SCB specimens prepared from gyratory-compacted mixtures were notched at three depths and tested at four different temperatures (23 °C, 0 °C, -11 °C, and -22 °C). The Two-Parameter Model (TPM), the compliance approach, and the J-integral method were employed to determine nonlinear fracture parameters, including fracture toughness, effective crack length, elastic modulus, and critical crack tip opening displacement (CTODc). Load CMOD curves were analyzed to determine elastic modulus from initial compliance values, while nonlinear fracture toughness was calculated based on equivalent crack length at peak load. Results showed that temperature is the most dominant variable influencing fracture behavior, explaining more than 75% of the observed variation. As the temperature decreased, the elastic modulus and fracture toughness significantly increased, indicating stiff and brittle behavior, whereas higher temperatures led to increased CTODc and more ductile fracture characteristics. The findings demonstrate that nonlinear fracture mechanics and TPM provide reliable and physically meaningful fracture characterization for asphalt mixtures. The outcomes highlight the importance of temperature in pavement fracture performance and confirm that nonlinear fracture approaches are useful tools for performance-based asphalt pavement design, particularly in cold climate regions susceptible to thermal cracking.
- MakaleAçık Erişim2026The Impact of Informal Employment on Macro Variables in Türkiye: An Empirical Analysis
Pehlivan, Ceren
Informal employment has a wide-ranging economic impact. In terms of economic implications, it can affect growth, labor force participation, inflation, and taxation. In Türkiye, informal employment, which has been frequently researched in the economy especially after 1990, continues to maintain its importance. The fact that the effectiveness of informal employment continues makes the subject worth researching. In this study, the impact of informal employment on macroeconomic indicators in Turkey was investigated. The study's methodology included time series analyses spanning the years 1993 to 2024. In the study with informal employment as the dependent variable, macroeconomic factors such as inflation, growth, current account deficit, and unemployment were represented. Descriptive statistics of the variables were provided initially in the study, and their stationarity was then assessed using the unit root test. The long-term link between variables that were stationary at the same level was ascertained using the cointegration test. The FMOLS test was used to examine how the variables affected the dependent variable. Lastly, the study's causality test was used to ascertain the direction of the variables' effects on one another. The findings showed that during the studied period, informal employment in Turkey had an impact on macro factors.
- MakaleYalnız künye2026Investigation of flow design and deflector plate effect in air cooled battery pack at different discharge rates
Tuğan, Volkan; Yardımcı, Uğurcan
In this study, the effect of different flow designs and the use of deflector plates on the thermal performance of an air cooled battery pack was investigated using the CFD method. Model A, which has a conventional single inlet flow structures, was compared with Model B, which employs dual inlets and deflector plates. In both models, 24 cylindrical 18650 lithium-ion battery cells were used, and the inlet and outlet surface areas of the battery pack were designed to be equal. Analyses performed at 3C and 4C discharge rates showed that the dual inlet flow structure and deflector plates significantly improved the cooling efficiency of the battery pack. At a 3C discharge rate, the maximum battery temperature and maximum temperature difference obtained with Model B were 1.87 K and 1.08 K lower, respectively, compared to Model A. At a 4C discharge rate, this improvement became even more pronounced, with the maximum battery temperature reduced by 2.49 K and the maximum temperature difference decreased by 1.44 K. Examination of the temperature contours revealed that, in Model A, heat accumulation occurred particularly in the rear regions, whereas Model B achieved a more homogeneous temperature distribution.
- MakaleAçık Erişim2026THE IMPACT of ESG on BRAND TRUST, BRAND LOYALTY, and BRAND IMAGE in THE CONTEXT OF SUSTAINABILITY
Cevher, Muhammed Fatih; Gülter, Erkan
This study aims to reveal the impact of ESG on the concepts of brand image, brand trust, and brand loyalty. In addition, the study aims to reveal the mediating roles of brand image, and brand trust in the impact of ESG on brand loyalty. To achieve this goal, a survey was conducted with 322 consumers in Türkiye. Statistical analysis programs SmartPLS3 and SPSS24 were used to analyze the data obtained from the surveys. The results of the analysis revealed that ESG has a statistically significant and positive effect on brand image, brand trust and brand loyalty. Additionally, it was found that brand image and brand trust do not act as independent mediators in ESG’s effect on brand loyalty but rather act together and sequentially as mediators in ESG’s effect on brand loyalty. In addition, this study highlights the growing awareness of ESG issues in both theoretical and practical applications. In addition to increasing consumer awareness, it has been observed that brands also attach importance to ESG practices in order to gain a sustainable competitive advantage.
- MakaleAçık Erişim2026The New Dynamic of Global Competition: The Technological Utilization of Rare Earth Elements and Their Impact on International Relations
Durmuş, İrfan; Tam, Gürkan
Aim: This study aims to analyze the technological utilization, global reserve distribution, and production structures of rare earth elements (REEs), as well as the structural concentration and vulnerability of their supply chains, and to evaluate their implications for international relations, geopolitical power dynamics, and economic dependency. The study examines the strategic consequences of China’s dominance in global REE production and processing and develops policy recommendations regarding Türkiye’s potential integration into global value chains. Method: The research is designed as a secondary-data-based study employing a structured descriptive and comparative content analysis. Quantitative and qualitative datasets obtained from internationally recognized institutions, including the International Energy Agency (IEA), the U.S. Geological Survey (USGS), European Commission reports, and relevant national authorities, were systematically analyzed to assess reserve distribution, production concentration, and sectoral utilization patterns. Results: The findings demonstrate that REEs have evolved beyond their role as industrial raw materials and have become strategic instruments of global power projection. The high concentration of global production and processing capacity in China generates significant supply security risks and structural economic dependencies for advanced economies. While Türkiye’s declared reserve potential in Beylikova represents a substantial strategic opportunity, limitations in domestic processing capacity and high value-added manufacturing constitute major structural challenges. Conclusion: REEs have emerged as strategic commodities at the center of twenty-first-century geoeconomic competition, particularly in the contexts of energy transition, defense industries, and digital technologies. Ensuring sustainable supply security requires not only reserve diversification but also the development of refining capabilities, recycling technologies, and multilateral cooperation mechanisms. Türkiye’s ability to position itself as a reliable actor in global REE markets depends on the formulation of an integrated national strategy. Originality: This study contributes to the literature by approaching REEs through an interdisciplinary framework that integrates technological, geoeconomic, and international relations perspectives, thereby moving beyond purely geological or technical analyses.
- MakaleAçık Erişim2026Obtaining Natural Dye from Oak Tree and Examination of Dyeing Properties According to Different Methods
Fırat, Tülay
This study investigates the dyeing performance of a natural dye extracted from the branches and leaves of the oak tree (soredar) on muslin fabric. The plant materials were soaked in water for 24 h and subsequently boiled to obtain the dye extract. Dyeing experiments were conducted using conventional dyeing methods with and without mordanting. Copper sulphate, iron sulphate, and potassium dichromate were used as mordants to evaluate their influence on the dyeing behavior of the fabric. The color properties of the dyed samples were determined using spectrophotometric measurements based on the CIELab color system, and color strength (K/S) values were calculated using the Kubelka–Munk equation. In addition, the durability of the dyed fabrics was assessed through washing, rubbing, and light fastness tests according to relevant ISO standards. The results revealed that the type of mordant significantly affected both color strength and fastness performance. Among the tested mordants, copper sulphate produced the highest color strength, while iron sulphate also improved dye uptake compared with the non-mordanted sample. Overall, the findings demonstrate that oak-derived natural dye can be effectively applied to muslin fabric and that mordanting plays a crucial role in enhancing the color depth and durability of natural dyeing processes.
- MakaleAçık Erişim2026Dikkat Tabanlı Görsel–İşitsel Akış Füzyonu ile Sahne Sınıflandırma
Çelik, Yusuf
Bu çalışmada, sahne sınıflandırma görevlerinde görsel ve işitsel verilerin birlikte kullanılmasına yönelik, Gated Cross-Modal Attention Fusion Network (GCM-AFN) adı verilen çok modlu bir derin öğrenme mimarisi önerilmektedir. Önerilen yapıda, görsel akıştan EfficientNetV2 omurgası kullanılarak derin özellikler çıkarılırken, işitsel akışta MFCC tabanlı zaman-frekans temsilleri kullanılmaktadır. Her iki akıştan elde edilen özellik temsilleri, kapılı dikkat mekanizması aracılığıyla birleştirilmektedir. Model, çok kipli bilgilerin etkin biçimde bir araya getirilmesini sağlamak amacıyla yardımcı akış çıktıları ve dikkat tabanlı bir füzyon stratejisi içermektedir. Çapraz doğrulamaya dayalı deneysel sonuçlar, önerilen yaklaşımın tek akışlı modeller ve geleneksel füzyon yöntemlerine kıyasla daha yüksek doğruluk, daha düşük varyans ve sınıf bazında daha tutarlı bir performans sergilediğini göstermektedir. Elde edilen bulgular, dikkat tabanlı füzyonun görsel–işitsel sahne sınıflandırma görevlerinde etkili bir bilgi birleştirme yaklaşımı sunduğunu ortaya koymaktadır.
- MakaleAçık Erişim2026The Effect of Nurse-Parent Support on Coping with Anxiety, and Caregiver Burden Among Parents of Hospitalized Infants: A Cross-Sectional Study
Kaya, Ayla; Kemer, Duygu
Objective: This study aimed to evaluate the effect of nurse-parent support on coping with anxiety and caregiver burden among parents of hospitalized infants. Materials and Methods: This cross-sectional study included 214 parents of hospitalized infants from a comprehensive hospital in southern Türkiye. Data were collected between August 2023 and March 2024 using the “Nurse-Parent Support Tool,” “State Anxiety Inventory,” and “Burden Interview Scale.” The STROBE checklist was used for reporting. Results: In this study, 38.3% of the parents were 25 years of age or younger. Parents' perceptions of nurse-parent support were above average; anxiety was high, and caregiver burden was medium. Female parents with lower education levels, whose infants were seven months or older, perceived nurse-parent support as high, and had lower anxiety. In addition, caregiver burden was higher among parents aged 31 or older. There was a negative relationship between nurse-parent support and anxiety level, and a positive relationship between nurse-parent support and caregiver burden. A negative relationship was also observed between anxiety level and caregiver burden. Conclusion: Nurse-parent support was found to reduce parents' anxiety and increase caregiver burden. To improve the quality of care, pediatric nurses should consider parents’ anxiety and caregiver burden and prioritize providing appropriate support.
- MakaleAçık Erişim2026Food Literacy, Sustainable Eating Behaviors, and Healthy Eating Index in University Students
Yeşiltepe, Akgün; Haznedar, Nagihan Kırcalı; Macit, Arife
Objective: This study aims to examine the relationships among food literacy, sustainable and healthy eating behaviors, and Healthy Eating Index (HEI) scores among university students. Materials and Methods: This cross-sectional study was conducted with 301 volunteer university students using a structured questionnaire which included questions about general information, a sustainable and healthy eating behaviors scale (SHEB), a food literacy scale (FOODLIT), and a 24-hour dietary recall. HEI (2015) scores were calculated for all participants using 24-hour data. The statistical analysis of the data was performed using the JASP and SPSS (version 26.0) software. Results: The mean SHEB, FOODLIT, and HEI scores of the participants were 2.93±0.82, 33.13±12.55, and 41.22±11.44, respectively. A positive and significant relationship was found between FOODLIT and SHEB scores (r=0.418; p<0.05), and FOODLIT scores were found to explain 17.5% of the variance in SHEB scores (R2=0.175). In dimension analyses, environmentally safe and selection-planning skills stood out as variables associated with HEI scores, while no significant relationship was found between HEI scores and other variables. Conclusion: In conclusion, it is considered that food literacy is associated with sustainable eating behaviors, but this relationship may not directly reflect diet quality.
- MakaleAçık Erişim2026Sentiment Analysis of Monkeypox Tweets Using a Hybrid CNN-BiGRU Based Deep Learning Model
Can, Umit
Recently, epidemics have disrupted people's lives. Following the COVID-19 pandemic, cases of monkeypox, a rare disease, began to appear worldwide. These incidents raised societal tension and anxiety. Understanding public attitudes, sentiments, and perceptions regarding the epidemic is essential for developing and implementing effective policies and countermeasures. Online social media platforms are essential venues for expressing feelings and views. In particular, Twitter provides valuable information for measuring societal sentiment. Machine learning and deep learning methods have recently been widely used in social network analysis. Deep learning models, which deliver strong performance, particularly on complex and nonlinear problems, are used in natural language processing and text mining. In this study, a Convolutional Neural Network Bidirectional Gated Recurrent Unit (CNN-BiGRU) hybrid deep learning model was developed by combining a CNN and a BiGRU and applied for the monkeypox sentiment analysis. The dataset was labeled as positive, negative, or neutral with Valence Aware Dictionary and sEntiment Reasoner (VADER). In addition, FastText and Term Frequency-Inverse Document Frequency (TF-IDF) word-embedding methods were used for feature extraction, and the performance of machine-learning and deep-learning methods was evaluated separately. As a result of the experimental studies, the FastText-CNN-BiGRU model obtained the highest results with 0.9382 accuracy, 0.9347 macro precision, 0.9367 macro recall, 0.9355 macro F-score, and 0.9875 macro ROC-AUC. The FastText-CNN model was the second most successful, achieving 0.9303 accuracy, 0.9268 macro precision, 0.9280 macro recall, 0.9271 macro F-score, and 0.9862 macro ROC-AUC. The FastText-BiGRU model was the third most successful, achieving 0.9262 accuracy, 0.9224 macro precision, 0.9255 macro recall, 9236 macro F-score, and 0.9838 macro ROC-AUC.
- MakaleAçık Erişim2026Pohlia wahlenbergii (Bryophyta)’nin Biyoaktif Potansiyeli: Antioksidan, Antidiyabetik ve Antimikrobiyal Aktiviteleri
Alataş, Mevlüt; Erdem, Belgin; Çöteli, Ebru
Briyofitler, biyolojik aktiviteleri yeterince incelenmemiş önemli bir bitki grubunu oluşturmaktadır. Yapılarındaki çok sayıda biyoaktif bileşik, onları önemli kılmaktadır. Bu çalışmada, Pohlia wahlenbergii karayosununun aseton ve metanol özütlerinin in vitro antioksidan, antidiyabetik ve antimikrobiyal aktiviteleri değerlendirilmiştir. Antioksidan aktivitenin belirlenmesinde, bu özütlerin iki farklı radikale, DPPH. ve ABTS.+'ya karşı inhibitör güçleri ölçülmüştür. Sonuçlar, standart askorbik asit sonuçlarıyla karşılaştırıldı. Ayrıca bu ekstraktların antidiyabetik aktivitesini belirlemek için, α-amilaz enzim inhibisyonu ölçüldü. Sonuçları karşılaştırmak için akarboz ilacı kullanıldı. En yüksek DPPH. ve ABTS.+ radikal temizleme aktivitesi sırasıyla 1.509 ve 1.301 mg/mL IC₅₀ değerleriyle aseton ekstraktında gözlendi. ABTS.⁺ radikal temizleme aktivitesinin daha güçlü olduğu bulundu. Antidiyabetik aktivitenin belirlenmesinde, α-amilaz enzim inhibisyonu kullanıldı ve metanol ekstraktında en yüksek seviyede olduğu görüldü (1.792 mg/mL). Ekstraktların antioksidan ve antidiyabetik aktivitelere sahip olduğu belirlendi. Ayrıca, Pohlia wahlenbergii'den elde edilen özütlerin çeşitli patojen mikroorganizmalara karşı in vitro antimikrobiyal potansiyeli değerlendirilmiştir. Sonuçlar, güçlü antifungal aktivite göstermiştir; aseton özütü, standart ilaç Flukonazol'den daha iyi performans göstererek Candida albicans'a karşı 25 mm'lik bir inhibisyon bölgesi ve 16 µg/mL'lik bir MIC sergilemiştir. Metanol özütü de geniş spektrumlu antibakteriyel etkiler göstermiş, özellikle Bacillus cereus ve Salmonella typhimurium'a karşı 20 mm'lik bir inhibisyon bölgesi göstermiştir. Pohlia wahlenbergii'nin seçici antimikrobiyal özellikleri, yeni doğal antibiyotikler ve antifungal ajanlar geliştirmek için potansiyel bir kaynak olduğunu göstermektedir.
- MakaleAçık Erişim2026The Relationship Between Psychological Empowerment and Job Satisfaction: A Meta-Analysis Study
Gün, Gül
The purpose of this study is to examine the relationship between psychological empowerment and job satisfaction through meta-analysis. Within this scope, a meta-analysis was conducted on 19 studies that examined psychological empowerment alongside job satisfaction and provided the requisite sample sizes and Pearson correlation coefficients (r) for the meta-analysis. Values for effect size, publication bias, heterogeneity, and significance tests were obtained using CMA 4.0 software. PRISMA protocol steps were followed to report the study. Under the random effects model, the effect size between psychological empowerment and job satisfaction was calculated as r = 0.722, and the 95% confidence interval was 0.610 to 0.834, indicating a strong positive relationship. The heterogeneity test yielded an I² value of 95.94 % and a Q-value of 444.012, showing that the study has a heterogeneous structure. According to the random effects model results, Fisher's z effect size of 0.722 (0,610-0,834) was determined to be statistically significant (z=12.635; p=0.000). The finding demonstrates a high level of positive correlation between psychological empowerment and job satisfaction
- MakaleAçık Erişim2026Seasonal changes in oxidant and antioxidant biomarkers in liver and muscle of common carp (Cyprinus carpio) in Atatürk Dam Lake
Benzer, Fulya; Tepe, Rıdvan; Erisir, Mine; Turkoglu, Semra; Fırat, Özgür; Şahin, Ayse Gül; Sünbül, Muhammet Raşit; Örnekci, Gürel Nedim; Küçükyılmaz, Mehmet; Öz, Özden Barım
Seasonal investigations were conducted on 640 Cyprinus carpio specimens obtained through commercial fishing at four different stations (Gerger, Sitilce, Hosirge, and Samsat) in the Atatürk Dam Lake. MDA (malondialdehyde) levels were measured in the liver and muscle tissues of male and female fish; the results revealed a significant increase in MDA levels at stations exposed to point-source discharge. This indicates that pollution-induced oxidative stress in fish varies significantly across seasonal and regional scales. Among the stations compared, the lowest MDA values were detected in fish tissues from the Gerger station, while the highest values were recorded at the Sitilce and Hosirge stations. Analysis of SOD, GSH-Px, and GSH values across all stations showed that these parameters fluctuated in correlation with MDA levels thereby maintaining the oxidant-antioxidant balance. This study investigated seasonal and spatial variations in oxidative stress biomarkers in common carp (Cyprinus carpio) collected from four stations in Atatürk Dam Lake. A total of 640 specimens were analyzed for malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), and reduced glutathione (GSH) levels in liver and muscle tissues. Results showed that MDA levels were significantly higher in fish collected from Sitilce and Hosirge stations, indicating elevated lipid peroxidation associated with point-source pollution. In contrast, the lowest MDA levels were observed at the reference station, Gerger. Antioxidant enzyme activities (SOD, GSH-Px, and GSH) exhibited tissue-, season-, and site-dependent variations, suggesting adaptive responses to oxidative stress. Overall, the findings demonstrate that anthropogenic pressures in Atatürk Dam Lake significantly alter the oxidant–antioxidant balance in fish, highlighting the usefulness of these biomarkers for environmental monitoring.
- MakaleAçık Erişim2026Aşağı Kaleköy Barajında Heyelan Nedeniyle Oluşan Göçme Mekanizmasının Araştırılması ve Heyelan Önleme Tedbirleri
Şen Erdem, Özlem; Tan, Dilek Elif
Heyelanlar, doğal kaynaklı afetler içerisinde önemli bir yere sahiptir ve özellikle eğimli arazilerde meydana gelen bu olaylar, ciddi ekonomik ve çevresel zararlara yol açmaktadır. Türkiye’nin jeolojik yapısı, bu tür afetlere olan duyarlılığı artırmakta ve heyelan riskinin yönetilmesini gerekli kılmaktadır. Bu çalışmada, Bingöl ili sınırlarında yer alan Aşağı Kaleköy Barajı’nda meydana gelen heyelan olaylarının mekanizmaları incelenmiş ve bu heyelanı önleme amacıyla ortaya konulabilecek iyileştirme tekniği araştırılmıştır. Araştırma kapsamında, baraj alanındaki heyelan bölgelerinden elde edilen veriler ışığında, dinamik ve statik durumlar için güvenlik katsayıları hesaplanmıştır. Arazi çalışmaları sırasında yapılan ölçümler ve jeoteknik analizler sonucunda, heyelanın meydana geldiği bölgelerdeki zemin parametreleri, kayma yüzeylerinin konumları ve bu yüzeylerin stabilite durumları değerlendirilmiştir. Kullanılan limit denge ve sonlu elemanlar yöntemleriyle zemin stabilitesine yönelik analizler gerçekleştirilmiş ve sonuçlar doğrultusunda öneriler geliştirilmiştir. Analiz sonuçları, heyelanlı bölgelerde drenaj sistemlerinin ve yamaç düzenlemelerinin etkin bir şekilde uygulanması gerektiğini göstermiştir. Özellikle, kaya ankraj sistemleri, fore kazıklar ve istinat duvarları gibi mühendislik çözümleri, heyelan riskinin azaltılmasında etkili olmuştur. Ayrıca, heyelan sonrası şevlerde meydana gelen deformasyonların kontrol altına alınabilmesi için yamaç geometrisinin yeniden düzenlenmesi önerilmiştir. Bu çalışma, Aşağı Kaleköy Barajı özelinde heyelan mekanizmalarının anlaşılmasına ve bu tür afetlerin önlenmesi için alınması gereken önlemlerin belirlenmesine katkı sağlamaktadır. Çalışmada elde edilen bulgular, diğer baraj ve benzer eğimli arazilerde heyelan riski yönetimi açısından da yol gösterici olabilecek niteliktedir.
- MakaleAçık Erişim2026Effect of Source Parameter Variability on RVT-Based Site Response Analysis: A Case Study for the Aegean Region of Türkiye
Icen, Abdullah
This study investigates the influence of source parameter variability specifically stress drop and anelastic attenuation on site response analysis using the Random Vibration Theory (RVT) framework. Site amplifications were computed for a representative site in the Aegean region of Türkiye using four different source parameter sets based on regional literature. A single set of randomized Vs profiles was used to account for subsurface variability, while varying source models enabled the evaluation of epistemic uncertainty in site amplification. The epistemic uncertainty associated with source parameters, expressed as τsource, peaks at approximately 0.04 s, reflecting the sensitivity of high-frequency site response to stress drop and attenuation. The study provides a regionally calibrated quantification of source-parameter-driven epistemic uncertainty for the Aegean region. The findings emphasize the need to account for source-related uncertainty in seismic hazard assessment. Unlike most previous RVT-based studies, this work explicitly isolates and quantifies the effect of stress drop and attenuation on site amplification, highlighting a novel contributor to epistemic uncertainty. Future work should incorporate Monte Carlo simulation of source parameters to support PSHA applications.
- MakaleAçık Erişim2026Bibliometric Analysis of Research on Enabling School Structures: A Scientific Mapping of the Literature from 2001 to 2023
Zincirli, Muhammed; Özel, Sezai
The present study offers a bibliometric analysis of academic research concerning the enabling school structures. The study drew data from the Scopus database, identifying 298 publications spanning a 23-year period. In order to maintain analytical consistency and avoid distortions since 2024 was going on at the time of the research, 34 publications from that year were excluded, thereby narrowing the dataset to 264 items. The bibliometric mapping and data visualisation were performed using VOSviewer software. The publications were examined according to various criteria, including publication year, annual citation counts, publication type, country of origin, affiliated institutions, most-cited sources and authors, and keyword distribution. A salient finding of the study is the predominance of journal articles, which account for 220 entries, constituting approximately 83.3% of the total literature. With respect to national contributions, the United States is the leading nation, having published 101 scholarly works. Furthermore, the United States has distinguished itself through its robust international research collaborations. Co-citation analysis revealed Wayne K. Hoy as the most influential scholar in the field, with a total of 1,034 citations. At the institutional level, William & Mary University was the most prolific contributor, with a total of 12 publications. This study provides a comprehensive overview of the intellectual structure and publication trends related to enabling school structures. By highlighting key contributors, institutional affiliations, and evolving research patterns, it provides valuable insights for scholars and policymakers and is expected to guide future research in this domain.
- MakaleYalnız künye2026Evaluation of the Effects of Chrysin in Rats Developed with Lead Acetate-Induced Neurotoxicity Using Biochemical, Histopathological, and Immunohistochemical Methods
Kandemir, Fatih Mehmet; Benzer, Fulya; Küçükler, Sefa; Yildirim, Serkan; Kandemir, Özge; Dalkılınç, Elif; Uçar, Aybüke Gözde Gültekin
Lead (Pb) is a heavy metal with high toxicity that can cross the blood-brain barrier and accumulate in brain tissue, causing serious neurological disorders. The aim of this study is to evaluate the potential protective effect of chrysin (CHR) against Pb-induced neurotoxicity. Thirty-five male Sprague Dawley rats were divided into five groups: Control, CHR (50 mg/kg), Pb, Pb+CHR (25 mg/kg), and Pb+CHR (50 mg/kg). Rats were administered CHR (25 or 50 mg/kg) and Pb (30 mg/kg) orally for 7 days. Twenty-four hours after the last treatment, the rats were sacrificed under mild sevoflurane anesthesia by decapitation, and brain tissue samples were collected. Biochemical and histopathological methods were used to measure cholinergic enzyme activity, DNA damage, and oxidative stress parameters in brain tissue. CHR reduced levels of glial fibrillary acidic protein (GFAP), acetylcholinesterase (AChE), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) caused by Pb. Due to its antioxidant properties, CHR decreased Pb-induced lipid peroxidation while increasing glutathione (GSH) levels and the activities of catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPx). Based on biochemical and immunohistochemical analyses, CHR reduced cyclooxygenase-2 (COX-2), myeloperoxidase (MPO), nuclear factor kappa-B (NF-κB), neuronal nitric oxide synthase (nNOS), prostaglandin E2 (PGE-2), and p53 levels. These findings suggest that CHR may exert a therapeutic effect by alleviating oxidative stress and inflammation induced by Pb-induced neurotoxicity.
- MakaleAçık Erişim2026Bayesian vs. Frequentist Mixed-Effects for Regional Site Amplification
Icen, Abdullah
Accurate treatment of regional site effects is essential for partially non-ergodic Ground-Motion Models (GMMs). This study compares a Bayesian hierarchical regression implemented with brms to a frequentist mixed-effects formulation using lmer for estimating period-dependent site amplification. Both models adopt the same functional form with a global linear term, a nonlinear term, and region-specific random slope deviations. The analysis uses residuals from the updated Türkiye strong-motion database (SMD- TR), spanning four regions and wide ranges of VS30, magnitude, and distance. Results indicate strong agreement in global behavior: linear and nonlinear terms show similar period trends in both frameworks, and the combined regional slopes are essentially identical at all periods. The overall residual standard deviation is also nearly the same, implying comparable fit quality. Differences primarily concern decomposition and uncertainty representation. The Bayesian model resolves sharper period-dependent regional features—most notably a peak near T ≈ 0.8 s consistent with basin/edge effects—while lmer yields smoother, more conservative deviations. For median predictions, either framework is suitable because the combined coefficients and overall standard deviation coincide. For interpretation and uncertainty propagation—especially when period-dependent regional structure matters—the Bayesian approach is preferable. In addition, brms permits weakly informative priors that encode physical expectations, which stabilizes estimates in data-sparse regimes and helps prevent overfitting. Taken together, these results clarify when each framework is most appropriate: brms for physically constrained inference and robust uncertainty quantification, lmer for speed and simplicity when median predictions are the primary goal
- MakaleAçık Erişim2026The Role of Socio-Economic Development Level in Van Province on Migration
Pehlivan, Ceren; Yuzbasi, Bahadir; Tuncel, Gokhan
The evolution of socioeconomic indicators in Turkey is critical to the survival of regional differences. The difference in development between regions leads to migration between provinces. Particularly certain patterns of economic programs and social and political problems constitute the main reasons for the increase in migration between them. When examining migration, it must be considered together with the social and economic structure. Because the most visible phenomenon that reflects the developments in the economic and social structure is migration. Migration is explained and examined with different components in terms of its content. In our study we investigated the concept of migration, which has many effects and features, in the context of Van Province. The Geographically Weighted Regression and Ordinary Least Squares Analysis were used in the research. According to the OLS model, the level of socioeconomic development explained 36% of the total variance (adjusted R2) in migration The GWR model explained 53% of the total variance in migration by socioeconomic development level. This represents a 17% increase over the OLS model. The GWR model showed an increase in model fit, while the AIC criterion decreased when compared to the OLS model. Similarly, the fact that the sum of squares is less in the GWR model now proves its superiority
