Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Battal, Fetullah(10)
- Ayata, Ümit(8)
- Dertli, Enes(8)
- Kul, Murat(8)
- Kan, Muhammed Enes(7)
- Kaya, Yunus(7)
- Öztekin, Sebahat(7)
- Akeren, Zahide(6)
- Aydemir, Uğur(6)
- Bayraktar, Bülent(6)
- Korkmaz, Huseyin(6)
- Peker, Hüseyin(6)
- Aksakalli, Ayhan(5)
- Apak, Ömer Ceyhun(5)
- Banaz, Emrullah(5)
- Can, Zehra(5)
- Esmer, Yusuf(5)
- Hasar, Ugur Cem(5)
- Kutlu, Naciye(5)
- Sönmez Sari, Ebru(5)
- Sönmez Sarı, Ebru(5)
- Ulay, Göksel(5)
- Çolak, Murat(5)
- Ünlü, Hami(5)
- İspirli, Hümeyra(5)
- Aksan, Nurcan Demircan(4)
- Bayraktar, B.(4)
- Degirmenci, Yavuz(4)
- Doğan, Zeki(4)
- Ecem Bayram, Nesrin(4)
- Elmalı, Kübra(4)
- Iliev, Teodor(4)
- Kadakal, Mahir(4)
- Kalyoncuo, Servet(4)
- Semerci Çakmak, Vahide(4)
- Yayla, İbrahim Erdoğan(4)
- Zozik, Adalet(4)
- Öktem, Tuncay(4)
- Şenay, Volkan(4)
- Abdioglu, Murat(3)
Yayınlar
- MakaleAçık Erişim2025Scopus SJRQ3Investigation of cytochrome B mutations, and UCP2 and STC1 gene expressions in patients with bipolar disorder
Uzunçakmak, Sevgi Karabulut; Özcan, Halil; Dirican, Ebubekir
Objective The aim herein was to investigate mitochondrial cytochrome B (MT-CYB) mutations in individuals with bipolar disorder. Stanniocalcin-1 (STC1) and uncoupling protein 2 (UCP2) mRNA expressions and their relationship with clinical data and each other were also investigated. Method The blood samples of 100 individuals were included in this study. Real-time PCR was used to evaluate mRNA expressions of STC1 and UCP2. Genetic alterations were investigated via Sanger DNA sequencing. An in silico analysis was performed to reveal the phenotypic effects of MT-CYB mutations. Results In the MT-CYB gene of the bipolar disorder patients, the most seen mutations were the T194A A>G mutation at position 1532, G deletion at position 15498, and C>A L236I mutation at position 15452. Most of the mutations appeared to be neutral or benign. The UCP2 and STC1 mRNA expression levels were significantly higher in the patients than in the healthy controls (P = 0.0124 and P < 0.0001, respectively). The area under the curve values of the receiver operating characteristic curve analysis for UCP2 and STC1 were 0.6631 (P = 0.0123) and 0.8059 (P < 0.0001), respectively. No significant relationship was observed between the gene expressions and the routine laboratory findings. There was a positive correlation between the UCP2 and STC1 mRNA expressions in the bipolar disorder patients (r = 0.03559, P = 0.0306). Conclusion Expression of UCP2 and STC1 may be important parameters in bipolar disorder. MT-CYB mutations may be related to gene expressions. Comprehensive studies on bipolar disorder will help better understand UCP2 and STC1 gene functions.
- MakaleYalnız künye2025Scopus SJRQ3Biosynthesis of alternan-stabilized selenium nanoparticles: A study on characterization and applications for antibacterial and antifungal purposes
ElObeid, Tahra; Yilmaz, Mustafa Tahsin; Ispirli, Humeyra; Sagdic, Osman; Taylan, Osman; Basahel, Abdulrahman; Karaboga, Dervis; Durak, Muhammed Zeki; Dertli, Enes
In this study, the alternan/selenium nanoparticles (Alt/SeNPs) were characterized with respect to their formation, morphology, size, selenium distribution, molecular, crystallographic, and thermal properties using UV–Vis spectroscopy, SEM, TEM, EDAX, FTIR, XRD, DSC and TGA measurements. UV–VIS measurements confirmed the synthesis of nanoparticles by observing a maximum surface plasmon resonance peak at 212 nm. In this study, alternan contributed to stabilizing the dispersion of SeNPs, resulting in a cluster of spherical and well-dispersed nanoparticles ranging in size from 50 to 90 nanometers. Nanoparticles were found to be highly thermally stable and in a nanocrystalline structure. The ABTS and CUPRAC radical scavenging activities of Alt/SeNPs were remarkable (95% and 78% at 4 and 6 mg/mL levels of Alt/SeNPs, respectively). Alt/SeNPs had also good inhibitory activities (3.5–4.0 and 4–15 mm of inhibition zone levels at 5 mg/mL level of Alt/against foodborne pathogenic bacteria and fungi, respectively).
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İncele - MakaleAçık Erişim2025Scopus SJRQ2Tri-method analysis of contact mechanics in orthotropic-isotropic materials
Öner, Erdal; Oktay, Mine Gül; Uzun Yaylacı, Ecren; Yaylacı, Murat; Mirzaloğlu, İrem
This study examines the contact mechanics of a homogeneous orthotropic layer resting on a homogeneous isotropic half-space without being bonded, subjected to loading by a rigid cylindrical punch. The effect of the orthotropic layer’s body force has been taken into account in the study. The study is conducted in three phases. In the first phase, the contact problem is analytically tackled using advanced methods such as elasticity theory, integral transform techniques, and Gauss–Chebyshev integration. The second phase utilizes finite element analysis through ANSYS software, accurately modeling the system. In the final phase, an artificial neural network is employed, allowing the system to learn and recognize intricate patterns in the data. The standout feature of this study is its thorough comparison of these three distinct methodologies, offering a comprehensive understanding of the contact mechanics between isotropic and orthotropic materials. The results reveal key insights into contact length, maximum contact stress, critical separation load, and separation distance, all as functions of critical dimensionless parameters. This study is significant in today’s advancing field of contact mechanics as it not only explores the combined impact of body forces and the interaction between orthotropic and isotropic materials but also uniquely compares the results using three distinct methods, offering comprehensive insights that address both theoretical and practical challenges.
AtıfScopus27WoS27OpenAlex22İncele - MakaleAçık Erişim2025Scopus SJRQ1Difficulties in Emotion Regulation as a Mediator and Gender as a Moderator in the Relationship Between Problematic Digital Gaming and Life Satisfaction Among Adolescents
Yayla, İbrahim Erdoğan; Dombak, Kübra; Diril, Sena; Düşünceli, Betül; Çelik, Eyüp; Yildirim, Murat
Background: Problematic digital gaming has emerged as a significant behavioral concern among adolescents, with potential implications for well-being. Understanding the mechanisms through which problematic digital gaming affects life satisfaction and how these mechanisms may differ by gender is important for targeted interventions. Aims: This study aimed to investigate the mediating role of difficulties in emotion regulation and the moderating role of gender in the relationship between problematic digital gaming and life satisfaction among adolescents. Method: The sample consisted of 458 Turkish adolescents (232 females, 50.7%) aged between 14 and 18 years (M = 16.27). Participants completed the Game Addiction Scale for Adolescents—Short Form, the Life Satisfaction Scale, and the Difficulties in Emotion Regulation Scale—8. Results: Problematic digital gaming was found to have a significant negative association with life satisfaction. Difficulties in emotion regulation significantly mediated the relationship between problematic digital gaming and life satisfaction. Furthermore, gender moderated this mediation effect, with difficulties in emotion regulation being more pronounced among males than females. Conclusions: The findings highlight the importance of emotional regulation in understanding the negative impact of problematic digital gaming on adolescents’ life satisfaction, particularly among males. These results suggest the need for gender-sensitive approaches in interventions aimed at improving emotion regulation skills and reducing problematic gaming behavior.
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İncele - MakaleAçık Erişim2025Scopus SJRQ2Optimization of Phenolic Compound Extraction from Bee Products via Solvent Systems and PCA Integration
Birinci, Ceren; Kara, Yakup; Gıdık, Betül; Kolaylı, Sevgi; Can, Zehra
To achieve a highly selective and sensitive analysis of phenolic compounds in bee products (honey, bee bread, and propolis), a simultaneous quantification of 25 phenolic compounds was performed using high-performance liquid chromatography coupled with a diode array detector. In the study, various solvents were utilized to enhance the phenolic profile of bee products, including pH 2 and 7 ultra-pure water, diethyl ether, and ethyl acetate. These included non-liquid–liquid extraction, pH 2 with 10 mL of pure water and 20 mL of diethyl ether; pH 2 with 10 mL of pure water and 20 mL of ethyl acetate; pH 2 with 10 mL of pure water, 10 mL of diethyl ether, and 10 mL of ethyl acetate; and pH 7 with 10 mL of pure water, 10 mL of diethyl ether, and 10 mL of ethyl acetate. Additionally, the integration of phenolic compounds identified through the enrichment method was pursued using principal component analysis (PCA). The extraction yields and recovery rates of phenolic compounds can be significantly improved by combining and integrating different extraction techniques. Our results demonstrated that using different solvent combinations significantly improved both the yield and diversity of phenolic compounds extracted from the complex matrices of bee products.
AtıfScopus2WoS2OpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ4Examining the Relationship Between Boxers' Sports Achievement Goals and Sports Anxiety Levels
Akyuz, Hayri; Zeze, Bahar
Purpose. The aim of this study is to examine the relationship between boxers' goal of success in sports and their levels of sports anxiety and to determine whether their goal of success in sports and their levels of sports anxiety differ according to demographic variables. Material & Methods. The research was conducted within the framework of descriptive and relational screening model methods. The population of the research consists of boxers who participated in the Turkish Individual Boxing Championship held in Bayburt province between June 28, 2025 and July 6, 2025. The research sample consists of n: 370 people selected from this population using simple random sampling method. Data collection tools included the "Personal Information Form", the "Sports Achievement Goal Scale (SAGS)", and the "Sports Anxiety Scale-2 (SAS)." Data were analyzed using the SPSS 27.0 program. The normality of the data distribution was assessed using kurtosis and skewness tests, concluding that the data followed a normal distribution. Furthermore, reliability analysis of the scale sub-dimensions and total scores indicated that both were reliable. Descriptive statistics included frequency, mean, and standard deviation; t-tests and ANOVA were used to examine differences between variables; and Pearson Correlation Test was used to analyze relationships between variables. Tukey test was applied for multiple comparisons. Significance value (p<0.05) was considered in the data analysis. Results. According to the t-test results, significant differences were found between the boxers' gender variable and the SAGS total scores and sub-dimensions in favor of male boxers (p<0.05). However, no significant difference was found between the international degree status variable and the scale total scores and sub-dimensions (p>0.05). On the other hand, significant differences were found between the boxers' sport category variable and the SAGS total scores and sub-dimensions in the ANOVA test results (p<0.05). Furthermore, the correlation test results revealed no correlation between the participants' age and sport age variables and the scale sub-dimensions and total scores (p>0.05). In addition, a low-level, negative, and significant correlation was found between the weight class variable and the total scores and subdimensions of the SAGS (p<0.05). Moreover, a low-level, positive, and significant correlation was found between the participants' weekly sport activity duration variable and the "somatic" sub-dimension of the SAS (p<0.05). Conclusions. Finally, low, moderate, and high-level positive correlations were found between the scale sub-dimensions and total scores. In conclusion, it can be said that as boxers' sports anxiety levels increase, their achievement goals in sports also increase. The findings indicate that boxers’ achievement goal orientations are important psychological determinants of competitive anxiety levels. These results provide important practical implications for training planning, psychological support practices, and particularly for rehabilitation-oriented interventions aimed at anxiety regulation. Taking achievement goal orientations into account may contribute to reducing injury risk, supporting recovery processes, and promoting long-term athlete health.
- MakaleAçık Erişim2025Scopus SJRQ3Perceived social support and school engagement in sports science students: The moderated mediation of school alienation and social media addiction
Esentürk, Oğuz Kaan; Seçer, Emrah; Yarimkaya, Erkan; İlhan, Ekrem Levent
Introduction and Purpose: This study investigated how sports science university students perceive social support (PSS), its influence on their academic engagement, and the mechanisms that mediate this relationship. Methodology: A total of 466 students (316 males, 150 females) from the Faculty of Sports Sciences participated in the study, which used a relational screening model. Data were collected using the Multidimensional Perceived Social Support Scale, the University Students School Engagement Scale, the School Alienation Scale, and the Social Media Addiction Scale. The measurement model was validated through confirmatory factor analysis, followed by correlation testing and regression analysis using the Bootstrap method to evaluate the study's hypotheses. Results: The analysis identified a positive correlation between PSS and school engagement (SE) (r = 0.45, p < 0.001). In contrast, PSS showed negative correlations with both school alienation (SA) (r =-0.209, p < 0.01) and social media addiction (SMA) (r = −0.113, p < 0.01) (Hypothesis I). Regression analysis using the Bootstrap method revealed a significant indirect effect of PSS on SE via SA (Hypothesis II) [β = 0.181, p < 0.001, 95% Confıdence Interval (CI) = (0.003, 0.039)]. Additionally, SMA moderated the indirect effect of PSS on SE via SA (Hypothesis III) [Situational mediator index = −0.018, Boot SE = 0.001, Boot 95% CI = (−0.003, −0.0001)]. The indirect effect was stronger for individuals with low SMA [Indirect effect = 0.034, Boot SE = 0.182, Boot 95% CI = (0.007, 0.078)] compared to those with high SMA [Indirect effect = 0.018, Boot SE = 0.009, Boot 95% CI = (0.005, 0.0416)]. Conclusion: The findings support all three hypotheses in the study's theoretical framework, confirming the proposed relationships and underlying mechanisms.
AtıfScopus1İncele - MakaleYayıncıda açık erişim2025Scopus SJRQ1Breaking the silence on late-life depression: uncovering the drivers of help-seeking in Türkiye’s ageing population
Ercan, Uğur; Apaydın, Emine; Alkan, Ömer
Background: Due to the prevalence of physical health issues among older adults, depression remains a significant health concern, which is often overlooked. Understanding the factors influencing the likelihood of seeking psychological support plays an important role in effectively managing depression in later life, where psychological support has a crucial role. This study aims to examine the factors associated with the likelihood of receiving psychological support among individuals aged 60 years and older experiencing depression in Türkiye. Methods: This study used microdata from the Türkiye Health Surveys conducted by Turkish Statistical Institute in 2016, 2019, and 2022. Gompit, binary logistic regression, and CHAID analyses were used to identify variables associated with psychological support-seeking behavior among older adults with depression. Results: The analysis revealed that general health status, illness status, gender, education level, and difficulty in healthcare payment significantly influenced the likelihood of receiving psychological support among older adults with depression. Conclusion: The results achieved in this study indicate that among older adults experiencing depression, women, those with higher educational levels, and those with existing illnesses are more likely to seek psychological support. Based on these results, it is recommended to develop educational programs to raise societal awareness about the importance of psychological support and to inform health policies accordingly.
AtıfScopus4WoS4OpenAlex4İncele - MakaleAçık Erişim2025Scopus SJRQ2Enzyme inhibitory, antioxidant, antimicrobial activities, and phenolic profiles of the methanol extract of Gelasia sericea an endemic species
AYGÜL, İmdat; AKMEŞE, Osman; SEFALI, Abdurrahman; BALTACI, Cemalettin; ÖZ, Mehmet; FIDAN, Muhammed Said
This study aimed to investigate, for the first time, the phytochemical composition, antioxidant, antimicrobial, and enzyme inhibitory properties of the methanolic extract of Gelasia sericea (Aucher ex DC.) Zaika, Sukhor. & N.Kilian. The extract demonstrated a moderate yield (6.55 g/100 g dry plant material) and was found to be rich in phenolic acids, particularly ferulic acid (17182.97 μg g-1), followed by caffeic acid, protocatechuic acid, and p-coumaric acid. Antioxidant analyses revealed high total phenolic (388.86 mg GA eq./100 g), total flavonoid (74.03 mg QE eq./100 g), and total antioxidant capacity (503.33 mg AA eq./100 g). The extract exhibited remarkable ABTS radical scavenging activity (95.99%, IC50 = 37.59 mg ml-1) and considerable ferric-ion reducing power (974.78 mg FeSO4 eq./100 g). Antimicrobial assays indicated moderate inhibitory effects, with stronger activity against Gram-positive bacteria (Staphylococcus aureus, Enterococcus faecalis) and the yeast Candida albicans, whereas Gram-negative bacteria were less susceptible. The extract’s MIC values ranged between 0.20-3.25 mg ml-1, and MLC values between 0.41-6.50 mg ml-1, which were higher than those of standard antibiotics. Enzyme inhibition assays revealed moderate activity against carbonic anhydrase II (IC50 = 0.0136 µg ml-1) and weak inhibition of cholinesterases and α-glucosidase, while α-amylase inhibition was relatively more pronounced (IC50 = 13350.00 µg ml-1). Overall, these findings highlight G. sericea as a valuable natural source of phenolic acids and antioxidants, with promising potential for applications in functional foods, nutraceuticals, and phytopharmaceuticals. However, the relatively limited antimicrobial and enzyme inhibitory activities suggest the need for further studies on bioavailability, in vivo efficacy, and compound isolation to optimize its practical applications.
- MakaleYalnız künye2025Scopus SJRQ1Multi-functional, multi-band, low-profile, ultra-thin, and cost-effective metasurface-based polarization converter
Kaya, Yunus; Hasar, Ugur Cem; Ozturk, Hamdullah; Ozturk, Gokhan
This article presents a polarization converter (PC) that demonstrates linear polarization (LP) to LP (LP–LP), circular polarization (CP) to CP (CP–CP), and LP to CP (LP–CP) conversion performance in microwave C-band (4–8 GHz), X-band (8–12 GHz), Ku-band (12–18 GHz), and K-band (18–27 GHz). The designed converter performs LP–LP conversion in the frequency ranges of 6.414–6.771 GHz, 10.681–12.160 GHz, and 18.093–19.045 GHz, CP–CP conversion in the same frequency ranges (6.414–6.771 GHz, 10.681–12.160 GHz, and 18.093–19.045 GHz), and LP–CP conversion in the frequency ranges of 7.374–9.414 GHz and 13.792–16.777 GHz. It is single-layer, metasurface-based, reflection-type (because it consists of a metasurface-substrate-metal ground adaptation), multi-band (five bands), multi-functional (because it shows all three LP–LP, LP–CP, and CP–CP conversions), ultra-thin (with a substrate thickness of 1.6 mm (0.034λ)), low-profile, and cost-effective (since relatively cheaper and easily available FR4 dielectric material is used). Simulations for the designed PC have been carried out by the 3D full electromagnetic simulation program — the Computer Simulation Technology (CST) Studio Suite. The performance analysis of the designed converter was carried out according to the reflection coefficients in the frequency range of 4–21 GHz. It was fabricated using the traditional printed circuit board production method, and its performance was validated in microwave X-band by free-space microwave measurements. More information about the conversion mechanism of the converter was also provided by parametric study and surface current analysis. It is observed that the PC design, which has wide angular independence (50°), can be configured to be efficiently used in radar cross section (RCS) reduction and stealth applications.
AtıfScopus10WoS10OpenAlex8İncele - MakaleAçık Erişim2025Scopus SJRQ1The Effect of Self-Regulated Learning-Based Practices on Writing Anxiety: A Curriculum-Focused Mixed Study
Kaplan, Kadir; Akeren, İhsan; Gülden, Bahadır
Anxiety is part of daily life, and when it is not controlled, it negatively affects performance and success. One type of anxiety that students experience at school as a result of the pressures of educational life is writing anxiety. In the current study, the role of self-regulated learning skills in reducing writing anxiety was examined. The fifth-grade self-regulated writing program (S-rWP) was developed, tested, and revised to align with the text types specified in the native language (L1) course curriculum. A multi-stage random sampling method was used to determine the participants to whom the final program would be applied, and the mean pre-test writing anxiety scores of the two groups, an experimental group and a control group, were close to each other. An instructor trained in self-regulated learning strategies conducted the seven-session program to the experimental group for 6 weeks, while in the same period the same curriculum was conducted to the control group using the traditional teaching method, and finally post-test measurements were taken. Quantitative data from the mixed-method study showed that S-rWP was effective in reducing writing anxiety compared to the standard teaching method. Qualitative data were collected through semi-structured interviews with the participants, the L1 teacher and the instructor. The results show that S-rWP is effective in reducing writing anxiety, in line with the quantitative findings. The participants provided information to support the findings through their opinions, and the L1 teacher and instructor provided information to support the findings through their observations. The results appear to stem from the overlap between students’ writing planning, implementation, and evaluation processes and the three stages of self-regulated learning (forethought, performance, and self-reflection). However, despite these positive outcomes, several suggestions for future research are proposed, taking into account the study’s limitations. © The Author(s) 2025. This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
AtıfScopus1İncele - MakaleAçık Erişim2025Scopus SJRQ1A qualitative study on Turkey's earthquakes, the century's catastrophe: Perspectives and coping methods of surviving nursing students
Sönmez Sari, Ebru; Terzi, Handan
Aim: To understand the experiences and coping strategies of nursing students who were impacted by Turkey's once-in-a-century catastrophic earthquakes in 2023. Background: Nursing students rarely experience a disaster in person, and their imagination can be limited. Methods: This study used a descriptive-qualitative study design. It was conducted with 17 first-year nursing students, studying at a university in the northeastern part of Turkey, who survived the earthquake. A personal information form and a semistructured questionnaire were used to collect the data. The data were collected between March and April 2023 and analyzed using the content analysis method and the MaXQDA programme. Results: The data were grouped into three main themes—“What ‘earthquake’ was and what it is now?,” “Am I aware of the ‘earthquake’ now?,” and “Coping mechanisms and supporting systems”—and categorized into seven subthemes. Conclusions: The experiences of earthquake-affected nursing students emphasized the importance of being prepared for disasters and meeting their emotional needs. Implications for nursing practice and policies: Including specific courses and case studies regarding disasters, whether natural or human-made, in education programs can ensure better prepared nurses. Also, the integration of content about management and coping with such crises into nursing curricula is considered vital.
AtıfScopus5WoS4OpenAlex7İncele - MakaleAçık Erişim2025Scopus SJRQ2A new approach to solving local fractional Riccati differential equations using the Adomian-Elzaki method
Aydemir, Hilal; Merdan, Mehmet; Demir, Ümit
The Elzaki-Adomian decomposition method (EADM) is intended to serve as an efficient analytical method for the resolution of these original fractional-order Riccati differential equations. This can be accomplished permanently by incorporating the Adomian decomposition method with Elzaki. The local fractional derivative is implemented in this format. Particularly in the context of nonlinear differential equations (ODE), this approach is preferred over digital gaps. Additionally, the method’s convergence. Random individuals with uniform, beta, normal, and gamma distributions are used to select the initial conditions or coefficients of the equations. The variance, confidence interval, and expected value of the solutions that are obtained will be determined. MATLAB (2013a) package software will be employed to display the individuals that were brought together, and the results will be analyzed randomly.
AtıfScopus1WoS1OpenAlex2İncele - MakaleAçık Erişim2025Scopus SJRQ4Synergistic electromagnetic wave absorbing properties of NiFe2O4/MWCNT composites synthesized via microwave-assisted combustion method in Ku-band
Johari, Mohd Hilmi; Ismail, Ismayadi; Azis, Rabaah Syahidah; Tim, Chan Kar; Nafis, Nur Biha Mohamed; Ertugrul, Mehmet; Karakaş, Ibrahim Hakki
This study investigates the synthesis, microstructural characteristics, magnetic properties, and electromagnetic wave absorption performance of nickel ferrite (NiFe2O4) composites reinforced with multi-walled carbon nanotubes (MWCNTs) synthesized via the microwave-assisted combustion (MAC) method. X-ray diffraction (XRD) analysis confirmed the desired structure of NiFe2O4 and the successful integration of MWCNTs within the NiFe2O4 matrix. Field emission scanning electron microscopy (FESEM) analysis revealed the entanglement of MWCNTs and their significant impact on hindering particle growth, resulting in a finer particle structure. The reduction in average particle size from 1.317 µm for pure NiFe2O4 to 0.436 µm for NiFe2O4 with 2wt% MWCNT, representing approximately a 66.89% reduction, significantly demonstrates the effectiveness of MWCNTs in limiting particle growth and promoting a more refined particle structure. Magnetic property analyses showed a nuanced interplay between MWCNT concentration and composite behaviour, with the saturation magnetization (Ms) exhibiting substantial enhancement in the NiFe2O4/2wt%MWCNT composite, indicative of effective alignment of magnetic moments. However, a subsequent decrease in Ms at higher MWCNT concentrations (4wt% and 6wt%) suggested potential dilution effects and disruptions in magnetic interactions within the composite. Electromagnetic wave absorption investigations revealed NiFe2O4/4wt%MWCNT as a highly efficient absorber in the Ku-band, with superior impedance matching and a high attenuation constant. The reflection loss (RL) reached a maximum of –17.58 dB at 12.78 GHz, signifying absorption of more than 99% of the incident EM wave in the microwave range. The favourable impedance matching and high attenuation constant contributed to the superior performance of NiFe2O4/4wt%MWCNT compared to pure NiFe2O4 and MWCNT. These findings suggest the potential of NiFe2O4/MWCNT composites for applications in telecommunications, aerospace, and electronics, with opportunities for further optimization and investigation into long-term stability and durability under varying environmental conditions.
AtıfScopus1WoS2OpenAlex1İncele - MakaleYalnız künye2025Scopus SJRQ1Analysis of the relationship between school leadership and collective teacher efficacy: a cultural comparison
Kaya, Metin; Demir, Mustafa
This meta-analysis study aims to analyze the relationship between school leadership and collective teacher efficacy in a cultural context. The meta-analysis included a total of 47 studies in different cultures in different countries. The results of the analysis for all 47 studies involved suggested a medium-level relationship between school leadership and collective teacher efficacy. The combined effect size was calculated for all studies according to random effect models (ES =.48). And it is concluded that the power distance and long-term orientation of countries positively predict the relationship between school leadership and collective teacher efficacy. In addition, it is concluded that the individualism tendency of countries negatively predicts the relationship between school leadership and collective teacher efficacy. Moreover, it is determined that the uncertainty avoidance and masculinity tendencies of countries do not predict the relationship between school leadership and collective teacher efficacy. In line with these results, school managers working in countries that have high power distance, collectivity, long-term investment, and limitation tendency should benefit from these opportunities to carry out and complete the school mission. School managers in countries that have low power distance, collectivity, long-term investment, and limitation tendency should develop different strategies.
AtıfScopus7WoS7İncele - MakaleAçık Erişim2025Scopus SJRQ2Advancing perovskite solar cells: Inorganic CCTS hole-transporting material for enhanced efficiency and stability
Sari, Fahriye; Ozel, Sultan Suleyman; Sarilmaz, Adem; Ozel, Faruk; Kus, Mahmut; Ersoz, Mustafa
One of the most effective methods for generating renewable energy is the efficient conversion of photons into electrical energy using environmentally sustainable materials. In recent years, the integration of chalcogenide materials, which exhibit graphene-like semiconducting properties and high charge carrier mobility, into perovskite solar cells (PSCs) has garnered significant attention for enhancing the performance, stability, and eco-friendly nature of these devices. In this study, Cu₂CoSnS₄ (CCTS) nanocrystals were synthesized and utilized as a fully inorganic hole transport layer (HTL) in inverted PSCs. Devices incorporating 6 vol% CCTS achieved a power conversion efficiency (PCE) of 10.07 %, and retained 93 % of their initial efficiency after 720 h under inert storage conditions, without encapsulation. This demonstrates a notable improvement in stability compared to conventional PEDOT: PSS-based devices. The optimized CCTS HTL provided better energy level alignment, reduced moisture ingress, and enhanced charge transport. These findings indicate that CCTS is a promising inorganic HTL candidate for efficient and stable PSCs.
AtıfScopus5WoS5OpenAlex4İncele - MakaleAçık Erişim2025Scopus SJRQ1Death anxiety and death literacy among Turkish patients with chronic diseases: a cross-sectional study
Semerci Çakmak, Vahide; Seven, Ahmet; Sönmez Sari, Ebru
Background: Death anxiety is common in patients with chronic diseases. Death literacy is a novel theoretical framework that enables patients to discuss death, accept it as a natural aspect of life, and get a deeper comprehension of it. However, it is unclear whether there is a relationship between death literacy and death anxiety. Furthermore, death literacy has not been sufficiently researched in Turkish society. This study investigated the levels of death anxiety and death literacy among Turkish patients with chronic diseases and the factors affecting death anxiety. Methods: This was a cross-sectional study. The sample consisted of Turkish patients with chronic diseases (n = 225). The data were collected with the Turkish Death Anxiety Scale and the Death Literacy Index. Pearson correlation, independent samples t test, One-Way ANOVA, and multiple linear regression were employed to analyse the data. Results: There exists a negative moderate correlation between death anxiety and death literacy. It has been determined that the factors that most influence patients’ fear of death are their level of death literacy and gender. These factors explained 12.8% of the variance in death anxiety (R2 = 0.128, F = 3.153, p < 0.001). Conclusions: The results suggest that death literacy level and gender were found to be factors affecting death anxiety of patients. Women have higher death anxiety scores. While the level of death literacy of Turkish patients with chronic diseases increases, their death anxiety decreases. The findings of the study were believed to offer a comprehensive information for healthcare practitioners in the management of such patients.
AtıfScopus14WoS15OpenAlex19İncele - MakaleAçık Erişim2025Scopus SJRQ1Stimulating Pro-Environmental Behavior Through Social Media Marketing in Environmental Organizations
Bilgin, Yusuf; Çetinkaya, Ali
Environmental organizations have increasingly utilized social media platforms to highlight issues related to climate change and environmental challenges, raise public awareness, foster engagement on environmental matters, cultivate a positive corporate image, and promote environmentally sustainable consumption practices. However, there is a lack of empirical evidence regarding the influence of these organizations' social media marketing strategies on their followers. The study aims to investigate the effect of environmental organizations’ social media marketing activities on brand image, online word-of-mouth communications, and the pro-environmental behaviors of followers. A quantitative approach was used in the research, and data were gathered through online questionnaires from 529 users who actively follow ten well-known environmental organizations on Facebook, Instagram, Twitter, and LinkedIn in Türkiye. The theoretical model and hypotheses were tested with Structural Equation Modeling (SEM). The social media marketing components of environmental organizations were defined as awareness, interaction, timeliness, customization, and advertising. As a result of the analysis, it was revealed that the social media marketing components of environmental organizations' awareness, timeliness, and interaction have a positive effect on the pro-environmental behaviors of the followers. At the same time, these components have a significant effect on brand image and online word-of-mouth in environmental organizations. In addition, it has been demonstrated that brand image and online word-of-mouth in environmental organizations significantly affect on the pro-environmental behaviors of the followers. The findings suggest that social media serves as an effective platform for environmental organizations to enhance their brand image and promote pro-environmental behavior. However, these organizations face challenges regarding the effectiveness of advertisements and the personalization of communication on these platforms.
AtıfScopus3OpenAlex5İncele - MakaleAçık Erişim2025Scopus SJRQ3Effect of Graviola Oil Extract on Anti-obesity Effect and Adipokine (Apelin and Adiponectin) Response in High Fat Diet-induced Obese Rats
Erkılıç, T. Orkun; Bayraktar, B.
Background: This study aims to investigate the anti-obesity effect of GOE with adipokine (apelin and adiponectin) response at different doses (100 and 200 mg/kg) of GOE in normal healthy and obese rats with High-fat diet (HF). Methods: In this study, 36 adult male Wistar albino rats, aged between 8-10 weeks, were used. 6 groups were created, with 6 rats in each group: Control (C), Rat group without GOE and HF application, G100 (GOE 100 mg/kg group given with oral gavage route of administration (OGRA), G200 (GOE 200 mg/kg group given with OGRA), HFC (HF control group): no HF and no GOE group), HF100 (rats receiving HF were 100 mg/kg graviola oil extract added to their diet), HF200 (rats receiving HF were 200 mg/kg graviola oil extract added to their diet). Blood samples were taken from the tail vein (vena caudalis) of all on days 0 and 60 of the study. Apelin and adiponectin levels in the serum samples were measured by ELISA method. Result: In the present study, a significant increase (p<0.01) was observed in the mean serum apelin level in the HF groups at the end of the 60 day after HF induction, while a significant decrease (p<0.01) was also detected in the adiponectin level. On the other hand, when examined in terms of BW, the most significant decrease due to GOE addition in the HF groups, i.e. the anti-obesity effect, was determined in the HFG200 mg/kg group (p<0.01). As a result, it was concluded that GOE may be safe and beneficial when administered at a dose of 200 mg/kg in obesity-induced rats.
AtıfScopus2WoS2İncele - BildiriAçık Erişim2025Analysis of Lightning-Induced Electromagnetic Pulses on High Voltage Transmission Lines
Cakil, Turan; Ozen, Sukru; Ates, Kayhan; Cakir, Mehmet
in this study investigates grounding enhancement techniques for power transmission lines, drawing an analogy with electromagnetic shielding methods. If we look at the basic analogy between electromagnetic shielding and grounding, the purpose of shielding is to prevent electromagnetic fields (both electrical and magnetic) from reaching an area or to reduce electromagnetic propagation. Grounding helps maintain signal quality, eliminate static buildup, and ensure the system meets EMC (electromagnetic compatibility) requirements by safely conducting the shield's parasitic potential to the ground. Examples of such structures include single-point grounding or two-point grounding and the use of mesh. The fundamental principle here is to reduce or prevent the interference of parasitic signals into the protected system. The objective is to improve the reliability and efficiency of transmission systems by optimizing grounding performance. Lightning and electromagnetic pulse (LEMP) intensity and current amplitude data obtained from the Turkish State Meteorological Service (TSMS) were used in the analysis. The electrical performance of the line and its resistance to LEMP-induced faults were evaluated through simulations using the Alternative Transients Program - Electromagnetic Transients Program (ATP-EMTP). The Seydişehir-Akseki-Varsak transmission line was selected as a case study. Results show that grounding improvements led to a significant reduction in the number of LEMP-related outages. Guy wires (GWs) enhanced the electromagnetic coupling between phase conductors and improved the dissipation of LEMP currents into the ground, thereby reducing the equivalent ground resistance. Due to the high cost of line surge arresters, the use of low-cost and easily deployable alternatives such as GWs is recommended. Further analysis on 400 kV transmission lines revealed that GW implementation reduced the flashover voltage at insulator terminals by up to 49%. These findings highlight the importance of cost-effective grounding methods in establishing reliable and sustainable power transmission infrastructure.