Araştırmacılar(9)

• Akın, Fatih
• Albayrak, Çigdem
• Basibuyuk, Kani
• Çiftci, Zeynep
• Daştan Yilmaz, Ayşe
• Özer Kenan, Elif
• Öztaşkin, Özlem Bektaş
• Sakal, Önder
• Turan, Sedat

• ArticleYayıncıda açık erişim2026/r/ebyu/19324
  Teknoloji, Yenilenebilir Enerji ve Sürdürülebilir Büyüme Ekseninde Çevre Kalitesi: CS-ARDL Analizi

  Şakalak, Ayşenur; Akın, Fatih; Dinçer, Selin

  Amaç: Bu çalışmada, 1990-2022 döneminde G-7 ülkelerinde yenilenebilir enerji, sürdürülebilir büyüme ve araştırma-geliştirme (Ar-Ge) harcamalarının çevre kalitesi üzerindeki etkilerinin incelenmesi amaçlanmaktadır. Yöntem: Çalışmada yenilenebilir enerji, sürdürülebilir büyüme ve Ar-Ge harcamalarının çevre kalitesi üzerindeki etkileri incelenirken panel CS-ARDL yöntemi kullanılmıştır. Bulgular: DH eşbütünleşme testi sonuçları, karbon emisyonları ile incelenen değişkenler arasında uzun dönemli bir eşbütünleşme ilişkisi bulunduğunu doğrulamaktadır. CS-ARDL analizi bulguları, ekonomik büyümenin başlangıçta karbon emisyonlarını artırdığını, ancak belirli bir gelir seviyesinden sonra bu etkinin tersine dönerek emisyonları azalttığını göstermektedir. Bu sonuç, Çevresel Kuznets Eğrisi (ÇKE) hipotezinin G-7 ülkeleri için geçerliliğini desteklemektedir. Ayrıca, yenilenebilir enerji tüketimi ve Ar-Ge harcamalarının karbon emisyonlarını azaltıcı yönde etkide bulunduğu tespit edilmiştir. Özgünlük: G-7 ülkeleri hem ekonomik büyüklükleri hem de Ar-Ge yatırımları bakımından küresel ölçekte öncü konumda yer almaktadır. Bu ülkelerin çevre üzerindeki etkilerinin kapsamlı ve güncel verilerle analiz edilmesi, yalnızca akademik literatüre katkı sağlamakla kalmayıp, aynı zamanda politika yapıcılar için pratik ve uygulanabilir öneriler sunma potansiyeli taşımaktadır. Dolayısıyla bu çalışma, G-7 ülkeleri özelinde yenilenebilir enerji, sürdürülebilir büyüme, teknoloji ve çevre kalitesi arasındaki ilişkileri inceleyerek literatüre özgün bir katkı sunmayı amaçlamaktadır.

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• ArticleYayıncıda açık erişim2026/r/ebyu/19312
  E7 Ülkelerinde Ekonomik İstikrarın Doğrudan Yabancı Yatırımlara Etkisi: Panel Fourier Toda-Yamamoto Nedensellik Analizi

  Akın, Fatih; Öncebe, Şaban

  Bu çalışmada, ekonomik büyüme, kişi başına düşen Gayri Safi Yurt İçi Hasıla (GSYİH), enflasyon, cari denge ve bütçe dengesi gibi makroekonomik değişkenleri kapsayan ekonomik istikrar endeksinin doğrudan yabancı yatırımlar (DYY) üzerindeki etkisi, yükselen piyasa ekonomilerinden oluşan E7 ülkeleri (Çin, Hindistan, Brezilya, Meksika, Endonezya, Rusya ve Türkiye) özelinde 1992-2023 dönemi için incelenmektedir. Analizde Panel DOLSMG ve Panel Fourier Toda-Yamamoto nedensellik testleri kullanılmış; kontrol değişkeni olarak gayri safi sabit sermaye oluşumu ve ticari açıklık modele dâhil edilmiştir. Panel DOLSMG bulguları, panel düzeyinde tüm değişkenlerin DYY üzerinde pozitif ve anlamlı etkiler oluşturduğunu göstermektedir. Ancak ülke bazında farklılıklar gözlemlenmiştir. Ekonomik istikrar Türkiye, Endonezya, Rusya ve Meksika’da pozitif etki oluştururken; diğer ülkelerde ise anlamlı bir ilişki bulunmamıştır. Gayri safi sabit sermaye oluşumu Çin, Endonezya, Rusya ve Türkiye’de pozitif; Hindistan’da ise negatif etki göstermiştir. Ticaret açıklığı Hindistan, Brezilya, Meksika, Rusya ve Türkiye’de pozitif etkiler oluştururken, Endonezya’da negatif, Çin’de ise anlamsız bulunmuştur. Panel Fourier TY nedensellik testi sonuçlarına göre, ekonomik istikrardan DYY’ye doğru tek yönlü ve gayri safi sabit sermaye ile DYY arasında ise çift yönlü nedensellik tespit edilmiştir. Özellikle Türkiye, Endonezya ve Rusya’da ekonomik istikrardan DYY’ye doğru tek yönlü nedensellik ilişkisi bulunmaktadır. Gayri safi sabit sermaye oluşumu açısından ise Brezilya, Endonezya ve Türkiye’de DYY’ye doğru tek yönlü ilişki vardır. Ticaret açıklığı için genel bir nedensellik ilişkisi bulunmazken, yalnızca Meksika’da bir ilişki belirlenmiştir.

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• ArticleYayıncıda açık erişim2026/r/ebyu/19030
  Çevresel phillips eğrisi hipotezinin geçerliliğinin analizi: cıvets ülkeleri örneği

  Akın, Fatih

  Bu çalışma, CIVETS ülkeleri (Kolombiya, Endonezya, Vietnam, Mısır, Türkiye ve Güney Afrika) için 1991-2022 döneminde çevresel Phillips eğrisinin geçerliliğini incelemektedir. Ekolojik ayak izi bağımlı değişken, işsizlik oranı temel açıklayıcı değişken, ekonomik büyüme ve yenilenebilir enerji tüketimi ise kontrol değişkenleri olarak modele dâhil edilmiştir. Uzun dönem analizinde panel DOLSMG yöntemi uygulanmış, nedensellik ilişkilerinin belirlenmesinde Canning ve Pedroni (2008) panel nedensellik testi kullanılmıştır. Bulgular, ekonomik büyümenin ekolojik ayak izi üzerinde pozitif ve anlamlı etkisi olduğunu, yenilenebilir enerji tüketiminin ise ekolojik ayak izini azalttığını göstermektedir. Ayrıca işsizlik oranının ekolojik ayak izi üzerindeki düşürücü etkisi, ekonomik durgunluk dönemlerinde çevresel baskının azaldığını ortaya koymaktadır. Çevresel Phillips eğrisi Kolombiya, Vietnam, Türkiye, Güney Afrika ve panel geneli için geçerli, Endonezya ve Mısır için geçerli bulunmamıştır. Nedensellik analizine göre, işsizlik ile yenilenebilir enerji tüketimi ve ekolojik ayak izi arasında çift yönlü; ekonomik büyümeden ekolojik ayak izi, yenilenebilir enerji ve işsizliğe tek yönlü; ekolojik ayak izinden yenilenebilir enerjiye ise tek yönlü nedensellik mevcuttur.

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• ArticleAçık Erişim2026/r/ebyu/19024
  The impact of perceived social support on maternal–infant bonding in the postpartum period

  Bulut, Hacer Kobya; Calik, Kiymet Yesilcicek; Daştan Yılmaz, Ayşe

  The study aimed to assess whether mothers’ perceptions of social support influence the quality of maternal–infant bonding after childbirth. A descriptive and correlational design was employed. The study was conducted between June and December 2024 with mothers of infants aged 1–4 months who attended the obstetrics, gynecology, and pediatrics outpatient clinics of Erzincan Binali Yıldırım University (EBYU) Mengücek Gazi Training and Research Hospital. The sample size was calculated as 471 using Epi Info with a 5% margin of error and 97% confidence level; the study was completed with 505 mothers. Data were collected through face-to-face interviews using the Descriptive Information Form, the Multidimensional Scale of Perceived Social Support (MSPSS), and the Maternal Attachment Inventory (MAI). The participants’ mean age was 30.04 ± 5.67 years, and 60.4% were between 26 and 34 years old. Nearly half had completed high school (49.5%), most lived in nuclear families (88.3%), the majority were housewives (81.8%), and most perceived their income level as moderate (81.6%). A positive and statistically significant correlation was found between total MSPSS and MAI scores (r=0.289, p<0.001). At the subscale level, the strongest correlation was observed between “significant other” support and bonding (r=0.311, p<0.001), followed by family (r=0.242, p<0.001) and friends (r=0.187, p<0.001). However, regression analyses including each subscale and the total MSPSS score independently revealed no significant predictive power for maternal bonding (t=0.777– 1.101, all p>0.05). Perceived social support has a positive relationship with maternal–infant bonding in the postpartum phase. However, in univariate models, its explanatory power is limited. These findings underscore the importance of strengthening partner and family support and integrating systematic social support screening into postpartum care practices.

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• ArticleYalnız künye2026/r/ebyu/11252
  Thermal and thermodynamic performance of a tube equipped with angled vane vortex generators: Cfd-based analysis of heat transfer, flow characteristics and irreversibility

  Firat, Ilker

  This study numerically investigates the first- and second-law thermodynamic performance of a circular tube equipped with novel angled vane vortex generators (AVVGs). The effects of vane angle (α = 10°, 20°, and 30°) and pitch ratio (PR = 5, 10, and 15) on heat transfer, friction loss (f), entropy generation (S˙gen′), exergy efficiency (ηEx), Bejan number (Be), and thermal performance factor (TPF) were analyzed using ANSYS Fluent 2021 with the SST k–ω turbulence model. Simulations were performed for water under turbulent flow conditions within a Reynolds number (Re) range of 12,770–20,824. The results demonstrated that AVVGs significantly enhanced convective heat transfer by intensifying flow mixing and disrupting the thermal boundary layer. The maximum Nusselt number (Nu) of 161.06 was achieved at PR = 5, α = 30°, and Re = 20,824, whereas the highest heat transfer enhancement ratio reached 1.37 compared with the plain tube. Although friction losses increased with decreasing pitch ratio and increasing vane angle, entropy generation due to heat transfer decreased considerably. The minimum total entropy generation (S'gen, tot = 0.1979 W m⁻1 K⁻1) occurred at PR = 5, α = 30°, and Re = 20,824. The highest thermal performance factor of 1.045 was obtained at PR = 15, α = 20°, and Re = 14,378, indicating the optimum thermohydraulic balance. Additionally, empirical correlations with prediction errors less than 7.2% were established for the Nusselt number, friction factor, and TPF. The proposed AVVG design demonstrates strong potential for improving the thermal and thermodynamic performance of compact heat exchanger systems.

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• ArticleYalnız künye2026/r/ebyu/10687
  Relactation Success: A Randomized Controlled Trial of Health Promotion Model-Based Education and Follow-Up

  Daştan Yilmaz, Ayşe; Yeşilçiçek Çalik, Kıymet

  Background: Early breastfeeding cessation due to physiological and psychosocial factors limits long-term maternal and infant health benefits. Relactation, the reinitiation of breastfeeding, is a promising strategy to restore lactation and improve well-being. This study aimed to evaluate the effect of education and follow-up based on Pender’s Health Promotion Model (HPM) on relactation success among mothers who had discontinued breastfeeding or experienced low milk supply. Methods: This randomized controlled trial was conducted between July and December 2023 in a hospital and five family health centers in eastern Türkiye. Seventy-three mothers (38 intervention, 35 control) with infants aged 15 days to 4 months who had ceased breastfeeding or used formula for 2–8 weeks were included. The intervention group received 8 weeks of relactation education and follow-up based on the HPM, whereas the control group received routine postnatal care. Data were collected using a personal information form, the Breastfeeding Self-Efficacy Scale-Short Form (BSES-SF), the Breastfeeding Motivation Scale (BMS), the LATCH tool, and a tool for assessing the level of maternal milk intake (IMDAT). Results: At the final follow-up, 65.8% of mothers in the intervention group achieved complete relactation, compared to 8.6% in the control group. The intervention group also had significantly higher BSES-SF, LATCH, and IMDAT scores. However, no significant differences were found in the BMS intrinsic motivation and identified regulation subscales. Conclusion: HPM-based education and follow-up significantly enhanced relactation success, self-efficacy, and breastfeeding skills.

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• ArticleAçık Erişim2026/r/ebyu/10684
  THE RELATIONSHIP BETWEEN EXTERNAL DEBT AND ENVIRONMENTAL QUALITY IN TÜRKIYE: A FRACTIONAL FREQUENCY FOURIER ARDL BOUNDS TEST APPROACH

  Akın, Fatih

  As efforts to achieve global sustainability goals intensify, it is increasingly important to understand the environmental consequences of countries’economic policies, particularly the impact o fmacroeconomic variables such as external debt. This study analyses the impact of Türkiye’s external debt on environmental sustainability for 1970–2023 using the Fractional Frequency Fourier Autoregressive Distributed Lag (FFF-ARDL) method. Moreover, the variables of economic growth, renewable energy consumption (REN), and non-renewable energy (NREN) consumption were included in the model, and the Environmental Kuznets Curve (EKC) hypothesis was tested. Carbon dioxide (CO2) emissions were used as a proxy for environmental sustainability. The long-run coefficient findings indicate that increases in external debt reduce CO2 emissions, while economic growth initially increases emissions but then declines after a certain income threshold, confirming the EKC hypothesis. Moreover, REN energy consumption decreases CO2 emissions, whereas NREN energy consumption increases them. The Fourier Toda-Yamamoto test results indicate unidirectional causality running from CO2 emissions, REN, and external debt to NREN consumption. There is also unidirectional causality running from economic growth, REN, and NREN consumption to external debt. These findings suggest that Türkiye’s external debt management and the transition toward REN sources are crucial for reducing CO2 emissions.

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• ArticleAçık Erişim2026/r/ebyu/10373
  Motivational dynamics of healthy living: a qualitative study based on self-determination theory

  Özer Kenan, Elif; Yılmaz, Necla

  Background: Healthy living behaviours play a central role in preventing chronic disease and improving population health; therefore, understanding the quality of motivation behind these behaviours is essential. This study aimed to explore the motivational factors that shape the adoption and maintenance of healthy living behaviours within the framework of Self-Determination Theory. Methods: A qualitative phenomenological design was employed. Semi-structured interviews were conducted with 18 adults living in different regions of Türkiye who had experience with healthy living. Data were analyzed using thematic analysis. Results: Motivation for healthy living was found to be multidimensional and emerged from the interplay of intrinsic and extrinsic factors. Participants reported that concerns related to aging and health, physical and psychological well-being, social desirability, family and social support, illness experiences, and cultural and spiritual values influenced their motivation. Some factors reflected intrinsic motivation, whereas several external influences were internalised over time and became more autonomous. Satisfaction of autonomy, competence, and relatedness needs played a central role in the sustained practice of healthy living behaviours. Conclusions: Motivation for healthy living is shaped not only by individual benefits but also by social, cultural, and spiritual contexts. The findings offer new insight into the process of motivational internalization and may guide public health strategies aimed at strengthening individuals’ motivational resources. Trial registration: Not applicable. This study was not a clinical trial.

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• ArticleAçık Erişim2026/r/ebyu/10167
  The Impact of Agricultural Value Added and Energy Consumption on Economic Growth in Türkiye: An Empirical Analysis; [Türkiye’de Tarımsal Katma Değer ile Enerji Tüketiminin Ekonomik Büyümeye Etkileri: Ampirik Bir Analiz]

  Akın, Fatih; Dinçer, Selin

  Climate change, global warming, natural disasters, wars, and global crises, which threaten the world's food supply, have made the agricultural sector fragile and strategically important, especially over the last century. Accordingly, it has become even more crucial for countries to have a strong agricultural infrastructure to ensure food security, maintain social stability, and reduce external dependence. In developing countries, in particular, the agricultural sector plays a critical role through functions such as job creation, reducing income inequality, and contributing to economic growth. For the Türkiye economy, the agricultural sector has historically been one of the cornerstones of the economic structure, providing raw materials to the industrial sector, supporting rural development, creating employment, and generating exports and foreign exchange earnings. On the other hand, energy consumption has become an indispensable element of production processes today. This study examines the impact of agricultural value added, gross fixed capital investment, and energy consumption on economic growth in Türkiye during the period 1968–2023 using the Fourier Engle-Granger cointegration test, Fourier Fully Modified Ordinary Least Squares (FMOLS), Fourier Dynamic Ordinary Least Squares (DOLS), and Fourier Canonical Cointegration Regression (CCR) methods. The results of the Fourier Engle-Granger cointegration test reveal a long-term relationship among the variables. The Fourier FMOLS, Fourier DOLS, and Fourier CCR estimation results indicate that agricultural value added, gross fixed capital investment, and energy consumption have positive and statistically significant effects on economic growth in both the short and long term.

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• ArticleYayıncıda açık erişim2026/r/ebyu/10099
  Understanding the challenges of international student integration: A qualitative study of faculty and administrator perspectives in Turkish higher education

  Çetinkaya, Bünyamin; Çiftci, Zeynep; Demir, Abdullah; Gülaçtı, Fikret; Göksu, Yeliz Tiryaki

  Türkiye's strategic geopolitical position has made it a growing destination for international students, yet higher education institutions face persistent challenges in supporting their integration. This qualitative case study examined the perspectives of 20 participants (13 faculty members and 7 administrators) from two public universities regarding institutional challenges and support strategies related to international student integration. Employing semi-structured interviews analyzed through thematic analysis, four interconnected challenge domains were identified: (i) language and communication barriers, (ii) academic adjustment, (iii) social adaptation, and (iv) legal and bureaucratic obstacles. Findings reveal that while faculty and administrators have developed a range of responsive practices, many remain informal and dependent on individual initiative rather than anchored in coordinated institutional policy. The study underscores the need for equity-oriented, system-level internationalization strategies in non-Anglophone contexts, and contributes to understanding integration as an organizational process mediated by institutional actors rather than solely a student-level adjustment challenge.

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