Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(102)
- Güler, Ömer(69)
- Akkurt, Nevzat(68)
- Tekin, H.O.(52)
- ALMisned, Ghada(49)
- Yucesan, Melih(49)
- Celik, Erkan(45)
- Zengin, Gokhan(40)
- Serdar, Osman(39)
- Kocabaş, Mehmet(37)
- Aslan, Naim(31)
- Baskonus, Haci Mehmet(31)
- Bulut, Hasan(31)
- Mete, Suleyman(31)
- Paksoy, Mehmet Yavuz(30)
- Kök, Mediha(27)
- Ince, Muharrem(26)
- Yildirim, Ozal(26)
- Özkul, İskender(26)
- Sulaiman, Tukur Abdulkadir(25)
- Topal, Murat(25)
- Guler, Omer(24)
- Serin, Faruk(23)
- Benzer, Fulya(22)
- Erten, Fusun(22)
- Alataş, Mevlüt(21)
- Güler, Seval Hale(21)
- Baykal, Duygu Sen(20)
- Taşgın, Yahya(20)
- Kutlu, Banu(19)
- Onat, Onur(19)
- Sahin, Kazim(19)
- Tanyol, Mehtap(19)
- Torğut, Gülben(19)
- Yildirim, Numan(19)
- Kahraman, Gökhan(18)
- Orhan, Cemal(18)
- Say, Yakup(18)
- Susam, Selim Orhun(18)
- Utku, Anıl(18)
Yayınlar
- MakaleYalnız künye2025Scopus SJRQ2The Relationship Between Employment Guilt and Psychological Resilience Levels of Working Mothers
Orhan, İlksen; Ünal, Esra; Ağralı, Cansu
Psychological resilience is a significant factor affecting feelings of guilt, as it helps mothers maintain a better balance between work and family responsibilities. This study was conducted to identify the relationship between employment guilt and the psychological resilience levels of working mothers. The research involved 483 working mothers residing in Osmaniye province, Turkey, who were employed in various fields. In this cross-sectional correlational study, data were collected online via Google Forms using the Personal Information Form, the Maternal Employment Guilt Scale, and the Brief Resilience Scale. The results of this study suggest that as the psychological resilience levels of working mothers increased, their employment guilt levels decreased. The results from this research can be used to identify potential interventions that could mitigate the negative effects of employment guilt on psychological resilience.
AtıfScopus4WoS4OpenAlex5
İncele - MakaleAçık Erişim2025Scopus SJRQ3Quality Culture and Impact Dynamics in Educational Institutions: A Qualitative Analysis Based on the Experiences of School Administrators
Yaraş, Zübeyde; Gündüzalp, Seda
This study highlights the role of leadership in shaping quality processes within educational institutions, focusing on the development of a quality culture in schools in the K -12 system (from kindergarten to 12th grade). It explores the connection between leadership discourse and organizational transformation. Using a qualitative, phenomenological design, the study involved 22 school principals from preschool to high school, selected through purposive sampling. Data collected through semi -structured forms were analyzed using content analysis. Findings show that school leaders believe quality processes positively influence instructional quality, student development, organizational success, and culture. Leadership communication, shared values, and stakeholder involvement were seen as key to embedding quality in school functions. The study emphasizes the importance of quality culture in areas such as management processes, teaching practices, human resources, and quality control. Strategies like reward systems, promoting innovation, and effective talent management were identified as essential for fostering a quality culture. Challenges faced by administrators in this process were also revealed. To overcome these, suggestions include using positive reinforcement and offering training in quality management. Overall, the study integrates theoretical perspectives on leadership with practical insights into communication and strategy, concluding that a strong quality culture has a significant impact on educational policy.
- MakaleYalnız künye2025Scopus SJRQ2Annealing temperatures effects on structural and optical properties of CdO thin films
Aydin, Handan; Odak, Mehmet
In this study, the structural and optical properties of CdO thin films subjected to heat treatment at different temperatures were investigated. CdO films were deposited on glass substrates by thermal evaporation. X-ray diffraction technique (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and atomic force microscopy (AFM) measurements were taken to investigate the crystal structure and surface morphology of the prepared films UV-vis spectrometer was utilized to measure the optical properties. As a result of XRD measurements, it was observed that the CdO thin film without and with heat treatment has a cubic crystal structure. The increase in the sharpness of x-ray peaks in CdO thin films with heat treatment means an increase in crystallization, and the calculated crystal sizes showed that the crystal size generally tends to increase with a rise in the applied annealing temperature. As can be seen from the SEM images, it was observed that the small grains on the surface were replaced by large grains as a result of the merger of small grains with each other with rising annealing temperature. The optical band gap Eg, which changes with heat treatment, was calculated to be between 2.45 and 2.27 eV. It was concluded that heat treatment improves the conductivity of CdO thin films by reducing the Eg value.
AtıfScopus1WoS1OpenAlex3İncele - MakaleAçık Erişim2025Scopus SJRQ3Sexually transmitted diseases-related knowledge levels of midwifery students studying at two different universities: A comparative study
Yeşiltepe, Akgün; Ulucan, Mihriban; Akan, Ayşenur; Can, Hafize Öztürk
This study aimed to compare the knowledge levels of midwifery students from two universities in eastern and western Turkey regarding sexually transmitted diseases (STDs). A descriptive, comparative study was conducted with midwifery students from both regions.The average score on the STD Knowledge Test was 14.49±3.83. Students from the western university scored 14.63±3.60, while those from the eastern university scored 13.98±4.58. Among western university students, knowledge scores were significantly associated with factors such as year of study, place of residence, and prior sexual health education. For eastern university students, significant factors included age, year of study, social security status, and university-based sexual health education (p<0.05). It is recommended that educational programs be strengthened to enhance students' knowledge and improve access to accurate, reliable information. African Journal of Reproductive Health © 2025.; L'étude visait à comparer les niveaux de connaissance des étudiants sages-femmes de deux universités situées l'est et à l'ouest de la Turquie sur les maladies sexuellement transmissibles. Cette étude descriptive et comparative a été menée auprès d'étudiants des départements de sages-femmes de deux universités différentes situées dans les régions de l'est et de l'ouest de la Turquie. Le score moyen obtenu par le test de connaissances sur les maladies sexuellement transmissibles était de 14,49±3,83. Alors que le score moyen obtenu par « les participants fréquentant l'université de l'ouest de la Turquie était de 14.63±3.60, le score moyen obtenu par » les participants fréquentant l'université de l'est de la Turquie était de 13.98±4.58. Alors qu'il y avait une relation statistiquement significative entre les scores moyens obtenus au test de connaissance des maladies sexuellement transmissibles par les étudiants de l'université de l'ouest et les variables telles que l'année scolaire, le lieu de résidence, l'éducation à la santé sexuelle au lycée, l'éducation à la santé sexuelle à l'université, et la connaissance des maladies sexuellement transmissibles, il y avait une relation statistiquement significative entre les scores moyens obtenus à la même échelle par les étudiants de l'université de l'est et les variables telles que l'âge, l'année scolaire, la sécurité sociale, l'éducation à la santé sexuelle à l'université (p˂0,05). Le niveau de connaissance des étudiants sur les maladies sexuellement transmissibles est insuffisant; il est donc recommandé que les étudiants participent à des activités éducatives pour améliorer leur niveau de connaissance sur les maladies sexuellement transmissibles et pour leur permettre d'accéder à des sources précises et fiables.
- MakaleYalnız künye2025Scopus SJRQ1The Extraction of Rare-Earth Elements (REEs) from Spent Nickel–Metal Hydride (Ni–MH) Batteries by Bifunctional Ionic Liquids (Bif-ILs): Process Optimization and Kinetics Modeling
Erust, Ceren
The cathode material of nickel–metal hydride (Ni–MH) batteries includes nickel, cobalt, and rare-earth elements (REEs) such as La, Ce, Nd, and Pr, which are among the critical raw materials (CRMs). Ionic liquids as the environmentally friendly approaches are proposed by various investigations for the extraction of critical metals from spent Ni–MH batteries. In this study, three different Bifunctional Ionic Liquids (Bif-ILs) were designed for comparative studies, namely Aliquat 336–Cyanex 272 (AL–CY), Aliquat 336–PC88A (AL–PC), and Aliquat 336–D2EHPA (AL–D2). The extraction results indicated that temperature has a direct effect on the extraction of critical metals in the presence of all Bif-ILs. Among three types of Bif-ILs, AL–D2 has an optimal extraction power (La: 98.8%, Ce: 94.2%, Nd: 99.2%, and Pr: 98.4%) after precipitation of 99.99% of Ni and Co. Furthermore, kinetics modeling is used for reaction mechanisms investigation. Results indicated that the mixed controlled model by shrinking core model (diffusion controlled and chemical reaction controlled) was the best model fitted to all data (coefficient of determination (R2) > 0.90). according to the Arrhenius equation, activation energies for all REEs in the presence of all Bif-ILs are between 13 and 42 kJ/mol that reflects a mixed controlled reaction.
AtıfScopus2OpenAlex2İncele - MakaleAçık Erişim2025Scopus SJRQ1Deep learning and optimization-based feature selection for fetal health classification using CTG data
Kaya, Turgay; Kaya, Duygu; Atar, Fatmanur
This study introduces a DL and metaheuristic optimization-based framework for fetal health assessment using cardiotocography (CTG) signals to mitigate maternal and neonatal mortality. One-dimensional CTG signals were transformed into 2D representations, and deep feature extraction was performed using AlexNet. Feature vectors FC6, FC7, and their combination were subjected to optimization via Whale Optimization Algorithm (WOA + DL) and War Strategy Optimization (WSO + DL), utilizing updated fitness functions tailored for feature selection. Experimental results with SVM classifiers demonstrated superior performance with FC6 (89.98 %) and WSO + DL (90.17 %). FC6 exhibited strong discriminative capacity, while FC7 contained semantically richer features. The concatenated FC6 + FC7 vector increased feature diversity. WSO + DL achieved optimal balance across classification accuracy, feature subset size, convergence rate, and overall performance metrics. The integration of DL and metaheuristic algorithms effectively isolated informative feature subsets, improving training efficiency, minimizing redundant/noisy data, reducing overfitting risk, and enhancing classification accuracy. Optimization method selection proved critical to overall model performance.
AtıfScopus6WoS1OpenAlex6İncele - MakaleYalnız künye2025Scopus SJRQ2Eu2O3-driven tailoring strategies on Al6061-Alloy for nuclear applications: A comprehensive study on structural, physical, and radiation transmission properties
Basgoz, Oykum; Guler, Seval Hale; Guler, Omer; ALMisned, Ghada; Baykal, Duygu Sen; Kilic, G.; Tekin, H.O.
In this study, Al6061–Eu2O3 composites were fabricated via mechanical alloying and systematically characterized using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy to evaluate structural and compositional features. The incorporation of Eu2O3 in varying weight percentages (1–20 wt%) was confirmed by XRD, revealing phase retention and crystallite refinement, while SEM–EDS analyses indicated uniform elemental distribution at low doping and localized clustering at higher reinforcement levels. Radiation shielding properties were comprehensively assessed through mass and linear attenuation coefficients, half value layer, effective atomic number, fast neutron removal cross section, buildup factors, and photon transmission factors. The results demonstrated a strong correlation between increasing Eu2O3 content and improved shielding performance. The E20 composite exhibited a mass attenuation coefficient of 22.33 cm2/g at 0.015 MeV, over threefold higher than the base alloy, and fast neutron removal cross section improved by 22.5 % compared to Al6061 alone. Additionally, EBF and EABF values decreased significantly, confirming reduced secondary photon build-up. These findings validate the effectiveness of Eu2O3 as a reinforcement phase for tailoring Al6061 for multifunctional applications, particularly in nuclear, aerospace, and radiological environments requiring lightweight materials with superior gamma and neutron attenuation.
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ1MobileNet- and attention-based MLP-Mixer architecture for geographical-region recognition of a marine fish (Perciformes: Carangidae) using otolith images
Dürrani, Ömerhan; İşgüzar, Seda; İmak, Andaç; Ateşşahin, Tuncay; Cömert, Zafer; Dürrani, Syeda Zahra; Türkoğlu, Muammer
Fishery management is crucial to sustain marine ecosystems by preventing overfishing and ensuring a fair distribution of fishing quotas. Accurately identifying the geographical origins of fish stocks is a key challenge in region-specific management strategies. Otoliths, calcified structures found in the heads of all fish species (except sharks and rays), provide insights into the life history and geographical origins of these fish. Traditional otolith analysis is time-consuming and error-prone because of manual inspection. Our study presents a novel approach using deep learning and computer vision to automate the geographical recognition of fish using otolith images. We propose a model that integrates MobileNet, which is known for its efficiency, with an advanced Mlp-Mixer that incorporates an attention mechanism to extract enhanced features. When tested on a diverse dataset of otolith images from five regions, the proposed model achieved a remarkable 96% accuracy, significantly outperforming traditional methods. This high accuracy demonstrates the potential to revolutionise fishery management by providing a fast, reliable, and automated solution for geographical region identification. In conclusion, the proposed method demonstrates the transformative potential of combining MobileNet and an attention-based Mlp-Mixer for automated fish geographic recognition using otolith images. This innovative method addresses the limitations of traditional manual inspection and paves the way for more effective and sustainable fishery management practices.
AtıfScopus4OpenAlex4İncele - MakaleYalnız künye2025Scopus SJRQ1Evaluation of TiO2/ZnO/SnO2 multilayer thin films on Si(100) as triboelectric friction layer
Yüzüak, G. Durak; Yüzüak, E.
This study presents a novel multilayer-semiconductor triboelectric nanogenerator (MLSC-TENG) that enhances charge transfer and initial charge density to overcome the limitations of conventional TENGs by multilayer thin films composed of TiO2, ZnO, and SnO2. The device operates through contact electrification and electrostatic induction, featuring two distinct electrodes. The active negative layer is deposited on Si substrates with an Ag seed layer using magnetron sputtering, employing a PET/ITO counter-electrode. The system attains a maximum power density of 400 mW/m2 with a 100 MΩ load, a short-circuit current of 20 μA at 10 Hz, and an open-circuit voltage of ±55 V. Additionally, it powers 156 LEDs and exhibits an energy storage capacity of 16.9 μJ at 52 μF, highlighting its applicability for wearable electronics. This scalable and cost-effective approach highlights the significant role of semiconductor (SC) band structures in enhancing TENG performance and presents a viable pathway for sustainable energy harvesting. The demonstrated strategy has the potential to meaningfully influence the application of TENGs in energy harvesting systems, providing a cost-effective solution for powering wearable electronics. The study facilitates progress in sustainable energy solutions for future wearable technologies by tackling critical issues in energy conversion efficiency.
AtıfScopus2WoS3OpenAlex3İncele - MakaleAçık Erişim2025Scopus SJRQ1An efficient 2D hyper chaos and DNA encoding-based s-box generation method using chaotic evolutionary improvement algorithm for nonlinearity
Garipcan, Ali Murat; Aydin, Yılmaz; Özkaynak, Fatih
In this study, an innovative substitution box (s-box) method is proposed, which combines the complexity and unpredictability of chaotic systems with the natural randomness and security features of Deoxyribonucleic Acid (DNA) encoding, in response to the increasing security requirements in the field of modern cryptography. This method, based on the integration of a two-dimensional (2D) hyper-chaotic Vincent map (VM) and DNA encoding techniques, aims to produce secure and high-performance s-boxes. To evaluate the reliability of the s-boxes, fundamental cryptographic criteria such as nonlinearity (NL), strict avalanche criterion (SAC), differential probability (DP), linear approximation probability (LAP), and bit independence criterion (BIC) are considered. Additionally, a novel chaos-based evolutionary optimization algorithm is proposed to optimize the NL criterion of the s-boxes. This algorithm offers a cost-effective and highly efficient alternative compared to classical metaheuristic methods, providing a balanced structure between security and performance. Experimental findings and comparison results demonstrate that the proposed s-boxes offer effective and reliable solutions for modern cryptographic applications, such as secure data transmission and storage. From a broader perspective, the study makes a meaningful contribution to the literature in the field of data security by presenting a high-performance s-box design meeting the security requirements of cryptographic systems and is resilient against current threats.
AtıfScopus25WoS26OpenAlex23İncele - MakaleYalnız künye2025Scopus SJRQ3In Vitro Control of Anisakis Larvae Using Nanoemulsified Thyme, Garlic, and Grape Seed Essential Oils Combined with Brines
Cadun, Aslı; Pekmezci, Gökmen Zafer; Şen Yılmaz, Evren Burcu; Bulat, Fevziye Nihan; Demirtaş, Nida; Çaklı, Atilla; Inci, Abdullah; Yıldırım, Alparslan; Karademir, Gupse Kübra; Erdem, Omer Alper
Introduction: Anisakiasis is a zoonotic parasitic disease transmitted through consumption of fish, with increasing global cases. While thorough cooking kills Anisakis larvae, thermo-stable allergens can still cause allergic reactions. Traditional Mediterranean seafood methods such as marinating, salting, and brining, which lack heat treatment, pose a high risk of anisakiasis. Materials and methods: This study investigated the antilarval effects of nanoemulsions made from thyme, garlic, and grape seed essential oils combined with brines on Anisakis L3 larvae in vitro. Results: Larvae were collected from mackerel, chub mackerel, anchovy, horse mackerel, and sardine, with 1746 larvae examined, mostly Anisakis type I and molecularly identified as A. pegreffii. Thyme oil’s main components, carvacrol and thymol, showed strong antimicrobial and antioxidant effects and superior larvicidal activity at lower doses compared to garlic and grape seed oils. Garlic oil, rich in organosulfur compounds, was more effective in Lakerda samples. High salt brine alone inactivated larvae within 24 h. The thyme oil nanoemulsion had droplet sizes below 90 nm, enhancing stability, whereas garlic and grape seed oils had larger droplets. Conclusion: These results indicate that nanoemulsified essential oils, especially thyme oil, are promising natural agents to control Anisakis larvae in traditional sea-food products.
- MakaleYalnız künye2025Scopus SJRQ1Multivariable assessment of ınfill strategies for enhanced mechanical properties in 3D-printed curved beams
Arıkan, Volkan; Dogan, Akar
Purpose – This study specifically focuses on low-to-medium infill densities where the influence of internal geometry on structural performance becomes most dominant. This study aims to explore how different infill patterns and densities affect the mechanical response of curved-axis beams produced by fused filament fabrication-based additive manufacturing (AM), providing insights for optimizing lightweight and material-efficient components subjected to bending loads. Design/methodology/approach – Twenty-seven PLA-based specimens with varying curvature radii (500, 750 and 1000 mm), infill patterns (grid, triangular and trihexagonal) and densities (20%, 30% and 40%) were manufactured. Each was subjected to three-point bending tests following ASTM standards. The experimental approach focused on analyzing force-displacement behavior to evaluate stiffness, load capacity and deformation characteristics under static loading conditions. Findings – Increasing infill density enhanced the maximum force capacity of curved beams but reduced their displacement tolerance, reflecting greater rigidity. The trihexagonal (TH) pattern exhibited the highest displacement values, confirming its energy absorption capability, while the triangular (TA) pattern provided the greatest rigidity with lower deformation. The grid (GR) pattern showed intermediate behavior, with displacement capacity strongly influenced by curvature radius. Straighter beams generally displayed reduced displacement and higher stability, while more curved beams exhibited greater deformation. These results highlight the critical role of infill geometry and curvature in balancing strength, stiffness and energy absorption in three-dimensional (3D)-printed curved beams. Originality/value – Unlike prior studies that focus on high or near-solid infill levels, this work uniquely highlights the mechanical response of additively manufactured curved beams within the low-to-medium infill density range, where infill geometry plays a critical role. The study presents the first detailed comparison of how infill strategies interact with curvature in 3D-printed beams. It delivers practical design guidance for engineers working with curved structures in mechanical, aerospace and civil applications. Its novelty lies in demonstrating how trihexagonal patterns can optimize performance across various geometries, supporting enhanced structural resilience in AM.
- MakaleAçık Erişim2025Scopus SJRQ1Impacts of methyl jasmonate treatments on quality properties and bioactive compounds of jujube fruit (Ziziphus jujuba) during cold storage
Ozturk, Burhan; Karakaya, Orhan; Aglar, Erdal; Hancı, Mehmet Utku; Ozturk, Ahmet; Asghari, Mohammadreza
Background: Jujube is an important fruit species due to its high nutritional value and health benefits. However, the short shelf life of fruit causes quality losses, making it difficult to trade. This study was conducted to determine the effects of postharvest methyl jasmonate (MeJA) applications on the fruit quality and biochemical properties of ‘Li’ jujube (Ziziphus jujuba Mill.) cultivar. In the study, fruits were pre-cooled at 7 °C and 85 ± 5% humidity for 24 h and those with diseases, pests, and mechanical damage were eliminated. Then, MeJA was applied to the fruits at concentrations of 0.2 mM and 0.4 mM and stored at 0 ± 0.5 °C and 90 ± 5% humidity for 45 days and analyzes were performed at 15-day intervals. Results: This study showed that MeJA applications positively affected the postharvest quality of jujube fruit. MeJA-applied fruits exhibited lower weight loss and lower respiration rates, and MeJA applications helped preserve fruit color and maintained fruit firmness for a longer time. MeJA was effective in maintaining the total phenolic and flavonoid content in fruit content and the loss of vitamin C content was lower with MeJA application. MeJA was effective for determining soluble solids content (SSC), and titratable acidity and delayed ripening in fruit. Conclussion: MeJA application increases the commercial value of fruits by reducing weight loss, slowing down the ripening process, and preserving higher nutritional content and antioxidant activities and suggest that it can be used as a feasible method for improving fruit protection strategies. MeJA application stands out as an effective method for extending the shelf life of jujube fruits by preserving their post-harvest quality and nutritional values.
AtıfScopus7OpenAlex6İncele - MakaleAçık Erişim2025Scopus SJRQ3Gynaecological cancer awareness and healthy lifestyle behaviors of women aged 20-65 years: A descriptive cross-sectional study
Yaşar, Beril Nisa; Şeker, Sevda Arslan
For both individual and community health, women's health is vital. In particular, gynecological cancers can be prevented or treated by adopting healthy lifestyles, raising awareness, and detecting them early. This study aimed to identify levels of gynecological cancer awareness and healthy lifestyle behaviors among women aged 20-65 years. There were 251 women in the descriptive cross-sectional study. The Gynecological Cancers Awareness Scale (GCAS), the Descriptive Characteristics Form, and the Healthy Lifestyle Behavior Scale-II (HLBS-II) were used to gather data. The data was analyzed using the Pearson's correlation test, multiple linear regression, and descriptive statistics. The average HLBS-II score was 123.53±20.75, while the average GCAS score was 149.64±21.30. The HLBS-II and GCAS scores showed a statistically significant positive correlation. Women knowledgeable about early diagnosis methods scored 10.758 times higher on the GCAS, while women familiar with vulvar self-examination scored 11.016 times higher. Employed women had a mean HLBS-II score 6.124 times higher than non-employed women (p<0.05). Women's awareness of gynecological cancer was high, but they also had moderately good lifestyle choices. To raise awareness and promote healthy lifestyle choices, healthcare professionals are advised to take part in health-promoting initiatives.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2025Scopus SJRQ2Comprehensive Computational Assessment of Al-Based High-Entropy Superalloys: Thermodynamic, Mechanical, and Radiation Shielding Characterization for Nuclear Applications
ALMisned, Ghada; Güler, Ömer; Özkul, İskender; Baykal, Duygu Sen; Alkarrani, Hessa; Kilic, G.; Mesbahi, A.; Tekin, H.O.
This study investigates the radiation shielding properties of aluminum-based superalloy high-entropy alloys (HEAs) for potential use in advanced nuclear reactor applications. These HEAs, composed of five or more metals in equimolar or near-equimolar ratios, were evaluated for their thermodynamic stability, mechanical strength, and radiation attenuation capabilities. Key parameters such as entropy of mixing (ΔSmix), enthalpy of mixing (ΔHmix), valence electron concentration (VEC), and atomic size difference (δ) were analyzed. Radiation shielding properties, including mass attenuation coefficients (MAC), half-value layer (HVL), effective atomic number (Zeff), and exposure buildup factor (EBF), were assessed using various simulations. Alloy 12, with its superior MAC, lowest HVL, and high ΣR value, demonstrated exceptional effectiveness in gamma and neutron attenuation. These findings underscore the potential of aluminum-based HEAs, particularly Alloy 12, to enhance the operational capabilities and longevity of nuclear reactors, paving the way for the development of next-generation materials for high-radiation environments.
- MakaleAçık Erişim2025Scopus SJRQ2Effect of Nano Titanium Dioxide on the Electrical and Thermal Properties of Poly(2,2,2-Trifluoroethyl Methacrylate) for Dielectric Materials
Barım, Esra; Torgut, Gülben
The increasing application areas of energy storage devices in recent years make it necessary to produce materials with sufficient efficiency. In this study, composites of poly(2,2,2-trifluoroethyl methacrylate) P(TFEM) homopolymer with nano titanium dioxide (TiO2 NPs) were prepared for applications of these devices requiring thermoelectric properties, and their thermal, dielectric, and electrical properties were investigated. Thermogravimetric analysis showed that TiO2 NPs in all composites limited the thermal diffusion of TiO2 NPs in the polymer matrix and increased the thermal stability of P(TFEM) from 341°C to 361.5°C. As dielectric properties, the dielectric constant (ε′), dielectric loss (ε″), AC conductivity (σac), and real (Z′) and imaginary (Z″) components of impedance of the composites containing TiO2 NPs were evaluated as functions of frequency and different weight percentages of TiO2 NPs. Increases in ε′ and ε″ at up to 15 wt% TiO2 NPs suggested increased dipole polarization. At 100 Hz, the ε″ value of P(TFEM) increased from 3.2 × 10−2 to 1.1 × 10−2, σac increased from 4.98 × 10−10 to 1.00 × 10−8, Z′ increased from 3.67 × 1010 to 8.66 × 1010, and Z″ increased from 2.09 × 108 to 4.42 × 108. Furthermore, ε′, ε″, and impedance decreased with increasing frequency for both P(TFEM) and TiO2 NPs composites, while σac increased with increasing frequency.
AtıfScopus3OpenAlex5İncele - MakaleAçık Erişim2025Scopus SJRQ2Exploration of UHPLC-ESI-QTOF-MS Profiles and the Neuroprotective, Antidiabetic, Antioxidant and Cytotoxic Effects of Extracts from Achillea maritima (L.) Ehrend. & Y.P.Guo (Asteraceae) Collected in Türkiye
Ahmed, Shakeel; Zengin, Gokhan; Fernández-Ochoa, Álvaro; de la Luz Cádiz-Gurrea, Maria; Leyva-Jiménez, Francisco Javier; Elkiran, Omer; Cakilcioglu, Ugur; Akgul, Bengusu H.; Pereira, Catarina G.; Custódio, Luísa
The current study investigated the chemical composition, antioxidant activity, enzyme inhibition, and cytotoxic activities of extracts from Achillea maritima, a wild medicinal plant used for various therapeutic purposes. The antioxidant activities were assayed through different assays like DPPH, ABTS, CUPRAC, FRAP, and phosphomolybdenum, whereas in enzyme inhibition studies, cholinesterase, tyrosinase, α-amylase, and α-glucosidase were assayed. Cytotoxicity studies are conducted on S17, RAW, and HepG2 to assess its selectivity and effectiveness. Chemical profiling by UHPLC-ESI-QTOF-MS revealed multiple bioactive compounds in the extracts. Polar solvents (ethanol, ethanol/water, and water) resulted in high concentrations of phenolic acids as well as chlorogenic and caffeoylquinic acids, as well as flavonoids like vicenin and apigenin. On the other, the nonpolar (hexane extract) was rich in octadecatrienoic acid hydroperoxy and hydroxyoctadecatrienic acid. Among these, the water extract contained the highest phenolic content of 32.26 mg GAE/g, while the ethyl acetate extract was the richest in flavonoids, with 7.83 mg RE/g. In the antioxidant studies, the water and ethanol/water extracts consistently display the most potent activities, thus indicating their significant free radical scavenging and metal chelation abilities. The studies on enzyme inhibitions showed remarkable BChE inhibitory activities of the ethanol extract in 12.50 mg GALAE/g, thus showing potential in managing disease conditions related to cholinesterase. Tyrosinase inhibition was significant by the ethanol extract, presenting 55.59 mg KAE/g. The ethyl acetate extract exhibited the most potent inhibitory activity against α-amylase with 0.66 mmol ACAE/g, while ethanol extract showed significant inhibition of α-glucosidase with 4.35 ACAE/g. Cytotoxicity results showed that the water extract was most effective against the HepG2 cancer cell line by reducing cell viability to 38.4% at high doses while preserving low toxicity against normal cells, as observed by high viability percentages in S17 and RAW cell lines. These results highlight the usefulness of A. maritima extracts in nutraceutical, pharmaceutical, and cosmeceutical applications.
AtıfScopus15İncele - MakaleAçık Erişim2025First Record of Dreissena caputlacus (Schütt, 1993) and Dreissena polymorpha gallandi (Locard, 1893) in Çamlıgöze Dam Lake (Sivas, Türkiye) and Evaluation of Some Biometric Parameters; [Çamlıgöze Baraj Gölü'nde (Sivas, Türkiye) Dreissena caputlacus (Schütt, 1993) ve Dreissena polymorpha gallandi (Locard, 1893)'nin İlk Kaydı ve Bazı Biyometrik Parametrelerin Değerlendirilmesi]
Kara, Cemil; Kutluyer Kocabaş, Filiz; Kocabaş, Mehmet; Bozali, Nuri; Gürlek, Mustafa Emre
In this study, the presence and biometric characteristics of Dreissena caputlacus (Schütt, 1993) and Dreissena polymorpha gallandi (Locard, 1893) populations were determined in Çamlıgöze Dam Lake. Shell length (SL), shell height (SH), shell width (SW) data of individuals collected in the study area were used with a digital caliper; The weights of individuals (W) were determined using precision scales. The means of SL, SW, SH and W in D. caputlacus and D. polymorpha gallandi were determined as 22.66±4.33 and 30.03±3.17 mm, 15.88±4.16 and 14.54±1.46 mm; 13.37±2.85 and 14.51±1.41 mm; 94±1.12 and 3.29±0.95 g, respectively. According to principal component analysis, there was a strong relationship between SH, SW, SL and W for both species. For D. caputlacus and D. polymorpha gallandi, 82.283% and 94.502% of the total variance was explained by two principal components. D. caputlacus and D. polymorpha gallandi populations from Çamlıgöze Dam Lake were reported for the first time in this study.
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İncele - MakaleAçık Erişim2025Scopus SJRQ3Direct and Inverse Scattering Problems for Sturm-Liouville Operator with Discontinuous Coefficient Under Discontinuity Conditions
Akcay, Ozge; Kosar, Nida Palamut
This paper deals with the study of the direct and inverse problems of scattering theory for Sturm-Liouville operator with piecewise continuous coefficient under the discontinuity conditions at the interior point of the positive semi-axis. The scattering properties are examined and the eigenfunction expansion is obtained. The fundamental equation or Marchenko-type equation of the inverse scattering problem is derived and an algorithm of the reconstruction of the potential according to scattering data of this problem is given. Moreover, the continuity of scattering function of this problem is examined.
- Kitap BölümüYalnız künye2025Bibliometric analysis of life cycle assessment and sustainable design literature using vosviewer
Ay, Ilhami; Dal, Murat
This study presents a comprehensive bibliometric analysis of the literature on Life Cycle Assessment (LCA) and sustainable design. As a result of a search of the Web of Science database, 655 articles were analysed and through these articles, the evolution, interaction and changes in the academic impact of the field were revealed. The increase in the number of publications and citations, especially since the 2010s, shows that the importance of this field in the academic world has increased. The fact that the majority of the articles are original researches shows that scientific activities in this field are carried out in depth. In addition, it has been determined that key concepts such as life cycle assessment and sustainable design are intensively included in the literature. The study also provides important findings on the most active authors, journals and articles in the field, emphasising the need for a multidisciplinary approach for future research.