Yayınlar
Koleksiyondaki öğeler
- MakaleAçık Erişim2026Scopus SJRQ1The Strategic Use of Instructor Visibility in Educational Videos: An Eye-Tracking Data-Based Study
Türel, Yalın Kılıç; Alpsülün, Mustafa; Yuruk, Süleyman Eren; Aslan, Alper; Kokoç, Mehmet; Polat, Hamza; Öztürk Akca, Cemile; Kurşun, Engin
This study developed an exploratory heuristic decision-support framework for dynamically regulating instructor visibility in instructional videos based on learners’ eye-tracking data. Eye-movement data were collected from 40 university students using a Tobii Pro Fusion while viewing 16 explanatory and procedural instructional videos. Instructor and Learning Content Areas of Interest were analyzed using normalized eye-tracking indicators. Descriptive analyses were complemented by Wilcoxon signed-rank tests, binary logistic regression, and receiver operating characteristic (ROC) analyses. Learners allocated significantly greater visual attention to learning content than to the instructor across both video types. Logistic regression identified instructor attention percentage, visit-related metrics, and blink frequency as significant predictors of visibility decisions. ROC analysis showed that instructor attention percentage provided the highest discriminative performance, with an optimal threshold of approximately 30%. Findings suggest that instructor visibility may be particularly appropriate during introductory, summary, and conceptually demanding segments, providing empirically grounded, attention-aware guidance for adaptive instructional video interfaces.
- MakaleYalnız künye2026Scopus SJRQ1Feeding problems in Turkish children with down syndrome and parental quality of life: A cross-sectional study
Okyar, Ferit; Kemer, Duygu
Background Children with Down syndrome (DS) often have feeding problems, which may negatively affect the quality of life (QoL) of their parents. This study aimed to identify feeding problems in children with DS and to examine the relationship between these feeding problems and parental QoL. Methods This cross-sectional study included 105 parents of children aged 10–18 years with DS in Turkey. Data were collected through face-to-face interviews using the Screening Tool of Feeding Problems (STEP) and the SF-36 Health Survey (SF-36). Results This study indicated that the mean STEP scale scores were below the average level across all frequency × severity subscales. Parents' mean scores on the SF-36 QoL scale were above the reference mean (x̄ = 50.00) for the physical functioning, vitality, mental health, social functioning, pain, and general health perception subscales, whereas scores for the physical role limitation and emotional role limitation subscales were below the reference mean. In this study, a moderate negative correlation was found between STEP subscale scores and parents' mean SF-36 subscale scores ( p ≤ 0.05). Conclusions In this study, a significant negative correlation was found between the STEP subscale scores and the parents' mean SF-36 subscale scores. Implications to practice: Routine feeding assessments using the STEP scale should be conducted for children with DS, and nurse-led parent education programs addressing feeding problems should be implemented.
- MakaleYalnız künye2026Scopus SJRQ2Experimental ınvestigation of hybrid passive cooling strategies for photovoltaic modules using nano-enhanced PCM and graphene-coated finned structures under hot climate conditions
Özdemir, Osman; Yücel, Halit Lutfi; Kahraman, Gökhan
This study experimentally investigates the use of several passive cooling techniques to enhance the electrical performance of photovoltaic (PV) modules under high ambient summer temperatures in Elazığ, Turkey. Throughout the trial period of July, August, and September, a system comprising four photovoltaic panels, one designated as a reference, was developed. The first passive cooling arrangement utilized a paraffin-based phase change material (PCM) RT42HC. In the second configuration, a nano-enhanced PCM (NePCM) composite was employed, prepared by dispersing 1 mass% of Al2O3 nanoparticles into the paraffin matrix and stabilizing them with 3 mass% of sodium dodecyl sulfate (SDS) to ensure homogeneous distribution. The third, hybrid configuration integrated 14 graphene-coated parabolic pin-tipped fins mounted externally onto the aluminum enclosure housing the NePCM composite. Experimental results demonstrated that the implemented passive cooling techniques markedly decreased the panel surface temperature, thereby enhancing electrical power output and photovoltaic efficiency. The hybrid graphene-coated fin-NePCM system demonstrated superior performance, achieving a maximum surface temperature reduction of 12.65 °C, a sustained electrical efficiency increase of 6–13%, and an average daily electrical energy gain of 26.23 Wh day−1 compared to the reference module. These findings demonstrate that the integrated hybrid design is an effective and reliable passive cooling method for sustaining photovoltaic system performance under hot climate conditions.
- MakaleYalnız künye2026Scopus SJRQ1High-temperature, freeze–thaw, and sulfate resistance of mortars incorporating ternary blends of fly ash, chromite, and waste glass
Gülmez, Nihan; Kanellopoulos, Antonios
The demand for sustainable construction materials promotes the use of industrial waste in cement-based systems. This study examines mortars incorporating fly ash (FA) (0%, 7.5%, and 15%), waste glass, and chromite aggregates for mechanical and durability performance. Specimens underwent compressive strength, freeze–thaw, high-temperature, sulfate attack, and ultrasonic pulse velocity tests, while microstructure was characterized by x-ray diffraction, thermogravimetric analysis, and scanning electron microscopy–energy-dispersive spectroscopy. Mortars with 7.5% FA exhibited relatively high compressive strength and improved freeze–thaw resistance. The combined use of chromite and FA improved strength retention at 800°C, reaching 23 MPa with 7.5% FA and 50% chromite. The greatest sulfate resistance occurred in mortars containing 15% FA and 15% waste glass, maintaining compressive strengths of 61 and 70.9 MPa after MgSO4 and Na2SO4 exposure, respectively.
- MakaleYalnız künye2026Scopus SJRQ1Evaluation of rainbow trout response to the optimal anesthetic concentration of citronella oil (Cymbopogon nardus) predicted by artificial neural network
Minaz, Mert; Félix, Luís M.; Er, Akif; Köse, Özay; Ak, Kübra; Alparslan, Cem; Serdar, Osman; Aydın, Baki; Kurtul, Irmak; Hoseini, Seyyed Morteza
Anesthesia practices in aquaculture are important for preventing potential stress in fish. For this purpose, interest in natural anesthetic agents as substitute for currently used synthetic anesthetics has increased. In this context, the present study demonstrated the anesthetic efficacy of citronella oil (Cymbopogon nardus) in rainbow trout (Oncorhynchus mykiss) individuals. Based on an artificial neural network (ANN) model derived from preliminary studies, the optimal anesthetic concentration for rainbow trout individuals was estimated as 90 μL L−1. Validation of the concentration predicted by ANN revealed no time-dependent hematological or histological effects on fish to citronella oil. Furthermore, biochemical tests revealed that the partial post-anesthesia increase in ALT and AST values was transient and negligible in light of histological findings. Although oxidative stress was observed during the acute period, the enzymatic activity of SOD and CAT effectively reduced the oxidative damage, demonstrating their role in protecting the fish from oxidative stress. The antioxidant activity observed was temporary, returning to baseline levels without any accompanying tissue damage at the tested concentration. Behavioral monitoring further indicated a swift reduction in motor activity followed by a smooth recovery process, with no evident signs of stress or avoidance behaviour. Overall, these results position citronella oil as a promising natural anesthetic for rainbow trout under the studied parameters. That said, further studies involving various solvents, temperature ranges, and fish species are necessary to comprehensively establish its efficacy and safety.
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İncele - MakaleAçık Erişim2026Scopus SJRQ1Pomological and Biochemical Characterization of Autochthonous Grape Varieties Grown in Türkiye
Karasu, Yakup; Dogan, Adnan; Aykut, Semih; Ozturk, Burhan; Aglar, Erdal
Grapevine (Vitis vinifera L.) is an important fruit crop with considerable morphological and biochemical diversity, and autochthonous genotypes represent valuable genetic resources for breeding and conservation programs. Many local varieties remain underexplored in terms of pomological and antioxidant traits. Eighteen indigenous grape genotypes collected from Muş province (Eastern Anatolia, Türkiye) were evaluated using morphological and biochemical parameters, including berry traits, phenolic composition, vitamin C, and antioxidant activity. Multivariate analyses including PCA, HCA, and Pearson correlation were performed to classify genotypes and determine trait relationships. The first two PCA components explained 51.9% of the total variation. Antioxidant-related traits mainly contributed to PC1, whereas berry size and anthocyanin content influenced PC2. HCA grouped the genotypes into distinct clusters according to antioxidant capacity and pomological characteristics. Correlation analysis showed significant positive relationships among antioxidant-related parameters. Berry size traits were positively correlated with each other, but negatively associated with seed number and skin thickness. The combined use of pomological, biochemical, and multivariate analyses proved useful for genotype classification. The identification of antioxidant-rich genotypes may support future breeding and conservation studies. The results highlight the importance of indigenous grape germplasm for sustainable viticulture.
- MakaleAçık Erişim2025Scopus SJRQ1Examining the trade-off between structural, mechanical properties and shielding performance of Pr2O3-enhanced 316L stainless steel
Yayla, Nihal; Albayrak, M.Gökhan; Güler, Ömer; Baykal, Duygu Sen; Alkarrani, Hessa; ALMisned, Ghada; Zakaly, Hesham M.H.; Tekin, H.O.
This study explores the structural, mechanical, and radiation shielding properties of 316L stainless steel composites reinforced with varying weight percentages of Pr2O3. The aim is to enhance radiation attenuation capabilities while maintaining structural integrity for nuclear applications. The composites were fabricated using the mechanical alloying method, followed by detailed characterization through X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Key radiation shielding parameters, including mass attenuation coefficient, linear attenuation coefficient, half-value layer, and effective atomic number, and transmission factor values were analysed using theoretical and computational models. Additionally, elastic modulus calculations were performed to assess mechanical properties. The results indicate that incorporating Pr2O3 significantly enhances shielding performance. The 316L-SS%20Pr2O3 composite exhibited the highest mass and linear attenuation coefficients values, with a notable reduction in half value layer values compared to the unreinforced 316L stainless steel. At lower photon energies, effective atomic number improved by 39.3 % for the 316L-SS%20Pr2O3 sample, while neutron shielding efficiency also increased. However, the elastic modulus decreased with higher Pr2O3 content, reflecting a trade-off between mechanical stiffness and radiation shielding efficiency. The findings demonstrate that 316L-SS%20Pr2O3 is a promising material for applications requiring superior radiation shielding, particularly in environments where mechanical load is secondary.
AtıfScopus8OpenAlex8İncele - DüzeltmeYayıncıda açık erişim2026Scopus SJRQ1Correction: Comprehensive Biological and Chemical Evaluation of Two Seseli Species (S. gummiferum and S. transcaucasicum) (Antioxidants, (2021), 10, 10, (1510), 10.3390/antiox10101510)
Zengin, Gokhan; Stojković, Dejan; Mahomoodally, Mohamad Fawzi; Jugreet, Bibi Sharmeen; Paksoy, Mehmet Yavuz; Ivanov, Marija; Gašić, Uroš; Gallo, Monica; Montesano, Domenico
In the original publication [1], there was a mistake in Figure 1 as published. The figure, as published, did not include the appropriate statistical information. We have revised the figure accordingly, and the corrected version of “Figure 1” is presented below. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.
- MakaleAçık Erişim2025Scopus SJRQ1Quality preservation of jujube fruit during cold storage: effect of maturity stage and modified atmosphere packaging
Gun, Sefa; Ozturk, Burhan; Aglar, Erdal; Karakaya, Orhan
Bacground: This study, which examines the effect between the maturity stage and modified atmosphere packaging (MAP) in order to prevent post-harvest quality losses and extend the storage life of jujube (Ziziphus jujuba Mill.) fruit, offers an important contribution to supply chain management. The fruits harvested at different maturity stages were stored at 0 ± 0.5 °C and 90 ± 5 RH in MAP and control conditions for 42 d and changes in quality, physiological and biochemical parameters were evaluated. Results: The lowest value was recorded in the early maturity (M-1) + MAP group for weight loss. Respiration rate decreased with advancing maturity, MAP treatments slowed down this process. Oxygen consumption and CO₂ production changed according to maturity level, MAP applications balanced gas exchange. MAP maintained brightness and color intensity of the fruit better. It also slowed down the firmness loss. The highest soluble solid content (SSC) was determined in the late maturity (M-3) + MAP group. Titratable acidity (TA) showed lower increase in MAP treatments. MAP significantly reduced the losses of vitamin C. Total phenolic, total flavonoids and antioxidant activity decreased during storage, while MAP treatments limited this decrease. Conclusions: The findings revealed that packaging jujube fruit with MAP, especially in early and mid-maturity stages, better preserves its quality parameters. Accordingly, MAP applications appropriate to the ripeness stage are recommended as an effective strategy to extend the fresh consumption period of jujube fruit and preserve its bioactive compounds.
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İncele - MakaleAçık Erişim2025Scopus SJRQ2Innovative image encryption approach based on bitwise XOR high nonlinear S-boxes and random permutation
Artuğer, Fırat
With today's developing technologies, the need for new image encryption algorithms to encrypt images is inevitable. In this study, an innovative image encryption algorithm is proposed. The proposed algorithm first XORs each layer of the image with a unique and strong new key. Each layer is then subjected to a random permutation process. Each of the encrypted layers obtained here is finally passed through a new s-box structure with a high nonlinearity value. After these processes, all layers are combined to obtain an encrypted image. Thus, XOR and s-box confusion meet the criteria, while random permutation meets the diffusion criteria. In this study, both key and s-box structures were originally obtained with a chaotic Gaussian map. The outputs of the chaotic map were converted into bit sequences and five different sequences with a length of 1 million were obtained. All these arrays have successfully passed all NIST SP 800-22 tests. On the other hand, the proposed s-box structures surpassed many studies with nonlinearity values of 108, 108.5, and 108.75. The images were successfully encrypted with the proposed algorithm, and the encrypted images successfully completed tests such as NPCR-UACI, information entropy, histogram analysis, and correlation analysis. It is thought that this study will make many contributions to the fields of s-box development, random number generation, and image encryption.
AtıfScopus3OpenAlex3İncele - MakaleAçık Erişim2026Scopus SJRQ1Removal of Reactive Blue 4 Dye from Aqueous Solution with Magnetic Fe3O4@Nd/Alg Beads
Karaaslan Ayhan, Nagihan; Seker, Seda
In this study, magnetic iron oxide@neodymium/alginate (Fe3O4@Nd/Alg) beads were prepared by ionic crosslinking with neodymium (Nd) ions, then subjected to heat treatment, and for the first time, effective removal of Reactive Blue 4 (RB 4) dye from aqueous solution was achieved with these beads. For this purpose, ideal adsorption conditions that significantly affect the removal of this dye were determined. The ideal adsorption conditions were determined as pH:5, contact time (t):60 min, amount of magnetic Fe3O4@Nd/Alg bead (m):10 mg, initial RB 4 dye concentration (C0):25 mg/L, temperature (T): 25 °C. Adsorption isotherm, kinetic and thermodynamic studies were carried out under the ideal adsorption conditions. The adsorption data was found to completely follow Langmuir model for RB 4 dye and the maximum adsorption capacity of RB 4 was found to be 263.16 mg/g. The adsorption kinetic data was found to be compatible with pseudo-second order and adsorption processes were explained by intraparticle diffusion. In adsorption thermodynamics studies, it has been determined that the nature of the adsorption reaction is spontaneous, endothermic and with increasing randomness. Furthermore, reuse studies of magnetic Fe3O4@Nd/Alg beads were carried out and it was determined that these beads could be used successfully up to 10 adsorption/desorption cycles.
AtıfScopus4WoS4OpenAlex4İncele - MakaleAçık Erişim2026Scopus SJRQ1Ajuga vestita Boiss: a “natural gold mine” for the design of novel nutraceuticals and phytopharmaceuticals
Cetiz, Mehmet Veysi; Zengin, Gokhan; Leyva-Jiménez, Francisco Javier; Fernández-Ochoa, Álvaro; de la Luz Cádiz-Gurrea, Maria; Custódio, Luísa; Rodrigues, Maria João; Pereira, Catarina G.; Lazarova, Irina; Balos, Mehmet Maruf
Members of the Ajuga genus are of significant interest due to their traditional applications in various countries, and have therefore been the subject of phytochemical research investigating their natural bioactive compounds. The aim of this study was to determine the chemical composition and biological activities of various Ajuga vestita extracts (ethyl acetate, ethanol, ethanol/water and water). The biological effects assessed included antioxidant, enzyme inhibition and cytotoxic activities. The extracts were chemically profiled using ultra-high-performance liquid chromatography – electrospray ionization – quadrupole time-of-flight mass spectrometry (UHPLC-ESI-QTOF-MS), which identified 121 compounds, including iridoids, flavonoids, and phenolic acids. The ethanol/water extract exhibited superior radical scavenging activity (2,2-Diphenyl-1-picrylhydrazyl (DPPH): 43.13 mg Trolox equivalent (TE)/g; 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS): 45.37 mg TE/g) and reducing power (cupric reducing antioxidant capacity (CUPRAC): 103.43 mg TE/g; ferric reducing antioxidant power (FRAP): 45.29 mg TE/g). Regarding enzyme inhibition, the ethanol extract exhibited the greatest inhibition of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), glucosidase, and tyrosinase, whereas the ethyl acetate extract was most effective against amylase. Regarding cytotoxicity, the ethyl acetate extract exhibited the strongest effect, significantly reducing cell viability in all cell lines and having a particularly strong impact on murine bone marrow stromal (S17) cells, with viability at 30.8 ± 2.7% at a concentration of 100 µg/mL. By contrast, the aqueous extract exhibited low cytotoxicity, maintaining high cell viability (over 94% at 50 µg/mL and over 74% at 100 µg/mL). Additionally, network pharmacology, molecular docking and molecular dynamics simulations were employed to investigate the multi-target mechanisms and binding stability of A. vestita phytochemicals. These findings provide new, detailed insights into A. vestita and suggest its potential as a raw material for developing health-promoting nutraceutical and pharmaceutical products.
- MakaleAçık Erişim2025Scopus SJRQ2A Novel CuAlMnFe/CeO2 Composite Alloy: Investigating the Wear and Corrosion Features
Doğan, Fatih; Duru, Erhan
Shape memory alloys (SMAs) are known for their exceptional mechanical properties, particularly their superior wear resistance compared to conventional alloys with similar surface hardness. Rare earth oxides are often used as additives to further improve these characteristics. This study investigates the effects of different CeO2 (cerium dioxide) concentrations (0.01 wt.%, 0.1 wt.%, 0.5 wt.%, and 1.0 wt.%) on the properties of CuAlMnFe alloys produced via powder metallurgy (PM). Various analyses were performed, including scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), as well as hardness, wear, and corrosion tests. The increase in wear rate is closely related to the formation of precipitates from CeO2 addition. Improvements in wear resistance and hardness are attributed to the effects of grain refinement and solid solution strengthening due to CeO2. Specifically, the wear rate increased from 1.5 × 10−3 mm3/(Nm) to 3.4 × 10−3 mm3/(Nm) with higher CeO2 content. Additionally, the friction coefficient of the CuAlMnFe alloy was reduced with CeO2 addition, indicating enhanced frictional properties. The optimal CeO2 concentration of 0.5% was found to improve grain uniformity, resulting in better wear resistance. Incorporating CeO2 particles into CuAlMnFe alloy enhances hardness and reduces wear rate when used in appropriate amounts. Additionally, it exhibits superior corrosion resistance, as evidenced by a positive shift in corrosion potential in Tafel measurements in solutions and a decrease in corrosion current density. The C0.5 specimen showed the highest corrosion potential (Ecorr, −588 V) and the lowest corrosion current density (icorr, 6.17 μA/cm2) during electrochemical corrosion in 3.5 wt.% NaCl solution.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2026Scopus SJRQ2Postural control impairment in chronic obstructive pulmonary disease (COPD): The role of respiratory muscle weakness and spinal curvature
Topcuoğlu, Ceyhun; Ozel, Alp; Tutun Yumin, Eylem; Sertel, Meral; Tug, Tuncer
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is associated with respiratory muscle dysfunction, postural alterations and balance impairment. However, the impact of respiratory muscle weakness on postural control and its relationship with spinal curvature and mobility remain insufficiently clarified. OBJECTIVES: The objectives of this study were to compare postural control in individuals with COPD with and without respiratory muscle weakness; to examine the relationship among spinal curvature, spinal mobility, postural control and respiratory muscle strength; and to determine the effect of respiratory muscle strength on postural control. METHODS: This cross-sectional study included 41 clinically stable individuals with COPD aged 40–75 years. Respiratory muscle strength was assessed using a mouth pressure measurement device. Postural control and balance were evaluated with the Biodex Balance System and functional tests. Higher stability index values indicate greater postural sway and poorer balance performance, whereas lower values reflect better postural stability. Spinal curvature and mobility were assessed using the Spinal Mouse®. RESULTS: Individuals with respiratory muscle weakness showed significantly higher overall, anterior–posterior and medial–lateral stability indices, as well as worse eyes-open and eyes-closed firm-surface indices compared to those without weakness (p < 0.05). In participants with severe and very severe COPD, thoracic kyphosis angle was significantly associated with MIP, MIP% and multiple balance indices under different surface and visual conditions (p < 0.05). CONCLUSIONS: Respiratory muscle weakness is associated with impaired postural control and balance performance in individuals with COPD, and thoracic spinal curvature appears to be linked to both respiratory muscle strength and balance outcomes.
- MakaleAçık Erişim2026Scopus SJRQ1The Efficacy of Structured Exercise Program Versus Aerobic Exercise in Tension-Type Headache: A Randomised Clinical Trial
Ataş, Kübra; Mutlu, Ebru Kaya
Background: Despite the widespread use of exercise in managing tension-type headache, there remains a lack of research on the effectiveness of combined structured exercise programs. The aim of this study was to investigate the effects of a structured exercise program versus aerobic exercise of equal duration on tension-type headache (TTH). Methods: Fifty-four female participants aged between 18 and 55 years were randomised to receive a 12-week exercise program, conducted twice a week for 45 min per session. The Structured Exercise Group (SEG) participated in a combination of aerobic, strengthening, and stretching exercises, whereas the Aerobic Exercise Group (AEG) performed only aerobic exercises. The primary outcome measure was the Headache Impact Test (HIT-6), a quality-of-life questionnaire. Secondary outcome measures included headache intensity, disability level, pressure pain threshold, proprioception, muscle strength, cervical posture, exercise capacity, anxiety, and depression. Results: Both groups showed statistically significant improvements in quality of life, pain intensity, disability, anxiety, depression, exercise capacity, pressure pain threshold, and proprioception (p < 0.05). Between-group comparisons revealed that the SEG demonstrated significantly greater improvements in quality of life, pressure pain threshold, proprioception, muscle strength, and posture (p < 0.05), whereas the AEG showed superior gains in exercise capacity (p < 0.05). Conclusion: Both exercise programs appear similarly effective for self-reported outcomes. Based on clinical measurement results, we recommend incorporating strengthening and stretching exercises into the aerobic exercise program and extending the duration to 12 weeks for additional benefits. Significance Statement: This study highlights the clinical value of supervised, physiotherapist-led exercise and the integration of personalised, multi-component strategies in managing tension-type headache. While both structured and aerobic programs improved pain, activity, and participation, the structured approach provided additional benefits in pressure pain threshold, proprioception, muscle strength, and posture. Tailoring interventions to individual clinical needs and extending the duration beyond 8 weeks may further enhance outcomes.
- Kitap BölümüYalnız künye2026Current Trends and Future Perspectives for Post-Disaster Assembly Areas
Polat, Elifcan Göçmen; Polat, Erkan
Disasters bring about significant material damage and social disruptions, affecting entire communities or specific groups. These events can halt daily life and human activities, often exceeding the handling capacity of the affected population. For effective disaster management, all stages-including prevention, mitigation, preparation, response, and recovery must be spatially planned. The identification of post-disaster assembly areas is critically important for minimizing loss of life and property. This study examines theoretical and practical research on assembly areas from the literature. In determining suitable assembly areas, factors such as population density, accessibility, proximity to hazard sources, land type, and access to essential services and methods as Geographical Information Systems (GIS) and Multi-Criteria Decision Making (MCDM) provide valuable framework for addressing assembly area selection challenges. Findings from the literature indicate that the assembly areas should be reassessed in the context of evolving needs and regulatory requirements.
