Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(64)
- Merdan, Mehmet(47)
- Baltaci, Cemalettin(35)
- Kulakaç, Nurşen(28)
- Duran, Celal(27)
- Ozdes, Duygu(24)
- Turan, Ibrahim(24)
- Demir, Selim(23)
- Türkkan, Tuğba(22)
- Bayrakdaroglu, Serdar(21)
- Topal, Fevzi(21)
- Öztürk, Serkan(21)
- Ürkek, Bayram(21)
- Gücer, Mehmet Ali(20)
- Akar, Zeynep(19)
- Kaygusuz, Abdullah(19)
- Topal, Meryem(19)
- Anaç, Halil(18)
- Aydin, Aydanur(18)
- Batan, Nevzat(18)
- Erata, Hüseyin(18)
- Tuncer, Metin(18)
- Akyürek, Suat(17)
- Baltacı, Cemalettin(17)
- Karimullah, Suud Sarim(17)
- Acet, Tuba(16)
- Akar, Bülent(16)
- Ashyralyyev, Charyyar(16)
- Düzgün, Azer Özad(16)
- Hintistan, Sevilay(16)
- Yılmaz, Coşkun(16)
- Aliyazicioglu, Yuksel(15)
- Kaya, Hacer(15)
- Kurnaz, Muammer(15)
- Kurt, Kemal(15)
- Ozden, Talat(15)
- Yilmaz, Coskun(15)
- Yuksel, Ferhat(15)
- Yücel, Cem(15)
- Öz, Mehmet(15)
Yayınlar
- MakaleAçık Erişim2026Scopus SJRQ1Modeling Long-Term Postseismic Deformation Following the 2020 Mw 7.0 Samos Earthquake Using Campaign and Continuous GNSS Observations
Solak, Halil Ibrahim; Tiryakioglu, Ibrahim; Gezgin, Cemil; Aladogan, Kayhan; Yalvaç, Sefa; Aktug, Bahadir; Yigit, Cemal Ozer; Dönmez, Ergin; Demirelli, Ertugrul; Eyübagil, Eda Esma
Highlights What are the main findings? What are the implications of the main findings?Highlights What are the main findings? What are the implications of the main findings?Abstract Postseismic deformation provides fundamental insights into earthquake-cycle processes, lithospheric rheology, and stress redistribution following large earthquakes. Although the 2020 Mw 7.0 Samos earthquake has been extensively investigated in terms of coseismic deformation and early postseismic behavior, the long-term evolution of deformation following the event remains poorly constrained. This study characterizes the long-term spatiotemporal evolution of postseismic deformation associated with the 2020 Mw 7.0 Samos earthquake using combined campaign and continuous GNSS observations. A total of 18 GNSS stations were analyzed over an approximately 4.5-year period following the earthquake. Pre-earthquake GNSS velocities were incorporated as prior constraints, while postseismic deformation was modeled using linear, logarithmic, exponential, and combined logarithmic-exponential functions. The preferred model for each station component was identified using the corrected Akaike Information Criterion (AICc), and model-selection robustness was evaluated through 1000 Monte Carlo observation-perturbation simulations. The results reveal a spatially heterogeneous postseismic deformation field with station-dependent temporal behavior. Among the nonlinear solutions passing the Monte Carlo and goodness-of-fit criteria, the seven single-process LOG and EXP solutions yielded characteristic relaxation times ranging from 182.6 to 730.5 days, with a median of 438.3 days. The two LOGEXP solutions additionally contained a logarithmic timescale of 109.6 days and exponential timescales of 292.2-438.3 days. These findings demonstrate that campaign GNSS observations, when integrated with continuous GNSS data and an objective statistical framework, can provide meaningful constraints on the long-term evolution of postseismic deformation despite sparse temporal sampling. More broadly, the results emphasize the strongly time-dependent nature of postseismic deformation and the critical role of observation timing in capturing its spatiotemporal evolution.
- MakaleAçık Erişim2026Scopus SJRQ1Designing an industrial-scale radio frequency decontamination process for peanut butter
Coskun, Eda; Ozturk, Samet; Tasci, Caner; Kahraman, Kubra; Liu, Shuxiang; Li, Rui; Wang, Shaojin; Mert, Behic; Marra, Francesco; Erdogdu, Ferruh
Centers for Disease Control and Prevention (CDC) has reported outbreaks of Salmonella, particularly associated with low-moisture foods including peanut butter. Even though roasting is included along the processing line, the presence of these safety issues indicates the requirement of process following the packaging of the samples. Because of the lower thermal diffusivity of the peanut butter, a conventional thermal process is expected to be challenging with expected temperature non-uniformities. Therefore, radio frequency (RF) heating was considered in this study for thermal processing of peanut butter samples. For this purpose, a computational model was developed to determine the temperature change of peanut butter samples. Experimental studies for model validation were completed in a 10 kW - 27.12 MHz RF system at 3300 and 4000 V electrode potentials. Following the model validation, a comparison to the conventional thermal processing was presented, and industrial scale thermal processing studies were applied where up to 30 packaged samples were placed within the RF cavity. Process efficiency was determined with the process time decrease, temperature uniformity and decontamination effects. Science4Impact: This study demonstrated RF processing for an efficient thermal decontamination with uniform temperature distribution attained within the samples in an industrial scale process.
- MakaleAçık Erişim2026Scopus SJRQ2In Vitro Antioxidant, Antibacterial, and Cholinesterase-Inhibitory Properties of an AqueousEuphorbia macrocladaRoot Extract Obtained by Ultrasound-Assisted Extraction
Gül, Abdulkadir; Yilmaz, Firat; Topal, Fevzi; Özgen, Inanc; Aydogmus, Ercan; Arslanoglu, Hasan
In the present study, the aqueous extract obtained from the roots of Euphorbia macroclada via ultrasound-assisted extraction (Ult-ER) was evaluated for its anticholinesterase (AChE and BChE), antioxidant, and antibacterial activities. While the extract exhibited weak inhibition against AChE (IC50: 507.69 +/- 17.95 mg/mL), it showed relatively greater inhibitory activity against BChE (IC50: 22.41 +/- 0.49 mg/mL). In antioxidant assays, Ult-ER exhibited measurable antioxidant responses, with DPPH and ABTS(+) radical-scavenging capacities of 18.33 +/- 0.49 and 119.59 +/- 1.86 mg TE/L, respectively. Its Fe-3(+) and Cu-2(+) reducing capacities were 128.51 +/- 12.57 and 670.33 +/- 11.59 mg TE/L, respectively. The total phenolic and flavonoid contents were 84.80 +/- 3.31 mg GAE/g and 60.67 +/- 2.29 mg QE/g, while the total antioxidant capacity was 9.78 +/- 0.44 mg TE/g and 15.62 +/- 1.85 mg BHAE/g. In the antibacterial evaluation, Ult-ER at the highest tested concentration of 8 mg/mL exhibited inhibitory activity against all tested strains, including Enterococcus faecalis ATCC 29212, Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 27853, whereas no detectable inhibition was observed at lower concentrations.
- MakaleAçık Erişim2026Scopus SJRQ2A combined Monte Carlo, analytical, and experimental study of true coincidence summing correction factors for 152Eu
Çelik, Necati; Ali, Ahmed H.; Apaydin, Gokhan; Çevik, Ugur; Açikel, Selami
The radionuclide 152Eu presents a significant challenge in gamma-ray spectrometry due to its complex decay scheme and significant true coincidence summing (TCS) effects, especially in close-measurement geometries. This study presents a comprehensive investigation into TCS correction factors for the principal gamma-ray lines of 152Eu using tripartite methodology: a custom Monte Carlo (MC) simulation based on the EGS4 system, an established analytical method, and direct experimental measurements. The MC simulation explicitly models the complete decay process, including branching ratios, gamma emissions, internal conversion, and subsequent X-ray emissions for both decay branches (beta-minus to 152Gd and EC to 152Sm). Experimentally, correction factors were derived using a well-characterized point source measured at multiple distances with a coaxial HPGe detector. The analytical, method based on probabilistic analysis of the decay scheme, served as an examination. Results demonstrate that the analytical method underestimated the TCS correction factors, particularly for low-energy lines such as 121.78 keV, where it predicted a mere 0.78 % correction compared to 25.5 and 23.5 % from MC and experiment, respectively. This discrepancy is attributed to the analytical method's neglect of gamma-X ray coincidences and the internal conversion effects. In contrast, the MC simulation showed remarkable agreement with experimental results across all energies, validating its capability to accurately model the full complexity of TCS effects. The study concludes that while analytical methods offer rapid estimates, MC simulations, especially when experimentally validated, are essential for achieving metrological accuracy in the gamma-ray spectrometric analysis of complex radionuclides like 152Eu.
AtıfScopus1WoS1
İncele - MakaleAçık Erişim2026Scopus SJRQ1Influencer Authenticity in Marketing: A Systematic Literature Review and Future Research Agenda
Celik, Fatih; Ibrahim, Blend; Polat, Eray; Moulard, Julie; Akbulut, Metin
As influencer marketing scales into a mainstream advertising channel, authenticity has become its defining currency, yet consumers and brands struggle to understand what makes a social media influencer (SMI) genuinely credible and why strategic authenticity backfires. Despite growing scholarly interest, research remains fragmented, leaving practitioners without a unified framework to guide their decisions. Through a systematic literature review (SLR) of 138 peer-reviewed articles (2011-2024), using topic modeling and thematic analysis, we identify the authenticity paradox, the inherent conflict that arises when SMIs attempt to commercialize their genuine self-presentation. This tension also explains why recent evidence reports no overall engagement benefit from perceived authenticity. Seven latent topics are synthesized into four integrated axes: (1) ontological tensions at the technological interface, (2) the commercial transparency and trust paradox, (3) ethical negotiation in identity construction, and (4) strategic consumer responses. Our findings reveal how consumers continuously navigate between SMIs' curated performances and perceived genuineness, with self-determination theory, attribution theory, and parasocial interaction theory dominating current explanations, predominantly within USA-based contexts. Beyond mapping the field, we specify three conceptual patterns, namely authenticity as attributed intent, transparency as coherence rather than concealment, and authenticity as a structurally constrained accomplishment. We then translate the gaps they expose into a structured research agenda, offering actionable insights for brands, managers, and platform designers on authenticity management, influencer selection, partnership governance, and performance evaluation.
- MakaleAçık Erişim2026Scopus SJRQ1Effects of Halotherapy as an Adjunct to Preseason Training on Respiratory and Aerobic Outcomes in Elite Female Football Players: A Randomized Controlled Trial
Sarisik, Derya Cetin; Aydin, Ahmet Serhat; Söyler, Mehmet; Zileli, Raif; Özkurt, Ali; Yilmaz, Coskun; Küçük, Hamza; Karatas, Mevlut
Background: Aerobic capacity and respiratory efficiency are critical determinants of performance in elite female football, characterized by repeated high-intensity efforts and rapid recovery demands. Halotherapy, involving the inhalation of dry salt aerosol, has been shown to improve pulmonary health; however, its effects on exercise-related outcomes in athletic populations remain insufficiently investigated. This study aimed to examine the effects of a 12-week post-training halotherapy intervention on respiratory muscle strength, pulmonary function, and aerobic performance in elite female football players. Methods: Twenty-eight elite female football players competing in the Turkish Women's First League were randomly assigned to a halotherapy group (HG, n = 14) or a control group (CG, n = 14). Both groups completed an identical preseason training program, while the HG additionally performed 45 min halotherapy sessions three times per week in a controlled halochamber. Pre-and post-intervention assessments included maximal inspiratory and expiratory pressures (MIP, MEP), spirometric parameters (FVC, FEV1, PEF, MVV), and maximal oxygen uptake (VO(2)max) estimated using the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT1), along with total distance covered. A 2 & times; 2 mixed-model ANOVA was used to assess time and group & times; time interaction effects. Results: Significant group & times; time interactions were observed for MIP, MEP, VO(2)max, FEV1, PEF, MVV, and Yo-Yo IRT1 performance (p < 0.05), with large effect sizes (eta p(2) = 0.269-0.924), favoring the halotherapy group. Forced vital capacity (FVC) increased over time in both groups (p = 0.141), with no significant interaction effect. Changes in the control group were comparatively smaller across most outcomes. Conclusion: Post-training halotherapy was associated with improvements in respiratory muscle strength, ventilatory function, aerobic capacity, and intermittent running performance in elite female football players. These findings suggest that halotherapy may be considered as a complementary, non-invasive strategy to support respiratory and aerobic adaptations. Further research is required to confirm these findings and to clarify the underlying physiological mechanisms. Trial registration: NCT07406386; 6 February 2026.
- MakaleAçık Erişim2026Scopus SJRQ1Effects of psychological skills training on self-control, perceived physical self-defense capacity, and mental toughness in elite female wrestlers: a randomized controlled trial
Tutal, Varol; Demir, Okan; Sahin, Oktay; Albayrak, Ahmet Yilmaz; Bayansalduz, Mehmet; Uzun, Recep Nur; Öz, Faik; Sahinler, Yunus; Ceylan, Levent; Yilmaz, Coskun
Background Self-control, self-defense self-efficacy, and mental resilience are fundamental psychological determinants of performance and competitive endurance in combat sports. However, scientific evidence on structured, evidence-based psychological intervention programs for professional female wrestlers remains limited. This study examined the effects of a psychological skills training (PST)-based intervention on self-control, self-defense self-efficacy, and mental resilience in professional female wrestlers. Methods A randomized controlled pre-test-post-test design was employed. Thirty-six professional female wrestlers (aged 18-25) were randomly assigned to a PST group (n = 18) or a control group (CG; n = 18). The PST group completed an 8-week structured psychological intervention alongside regular training, while the CG continued routine training only. Self-control, self-defense self-efficacy, and mental resilience were assessed pre-and post-intervention using valid and reliable psychometric scales. Data were analyzed via repeated-measures ANOVA, with effect sizes calculated. Results Significant group & times; time interactions were observed across multiple outcomes. A highly significant interaction emerged for perceived physical self-defense capacity (SP; F(1,34) = 56.525, p < 0.001, eta p(2) = 0.624) and for DP scores (F (1,34) = 9.360, p = 0.004, eta p(2) = 0.216). Among self-control subscales, significant interactions were found for inhibition (F (1,34) = 8.172, p = 0.007, eta p(2) = 0.194) and, more strongly, for initiation (F (1,34) = 14.157, p < 0.001, eta p(2) = 0.294). For mental resilience, highly significant interactions were detected for confidence (F (1,34) = 59.976, p < 0.001, eta p(2) = 0.638), control (F (1,34) = 32.486, p < 0.001, eta p(2) = 0.489), and persistence (F (1,34) = 32.709, p < 0.001, eta p(2) = 0.490). Overall, the intervention demonstrated medium-to-high effect sizes across psychological performance indicators. Conclusion These findings suggest that PST may serve as a useful complementary approach for enhancing self-control, perceived physical self-defense capacity, and mental toughness in professional female wrestlers. However, results should not be interpreted as evidence of improved competitive wrestling performance, technical success, or objectively measured physical self-defense ability, as these outcomes were not directly assessed in this study.
AtıfOpenAlex1
İncele - MakaleAçık Erişim2026Scopus SJRQ2Chemical Constituents and Biological Potentials of Teucrium scordium subsp. scordioides Extracts: In Vitro Experimental and In Silico Perspectives
Akgul, Bengusu Hacer; Yagi, Sakina; Cetiz, Mehmet Veysi; Saka, Enver; Zengin, Gokhan; Llorent-Martínez, Eulogio J.; Gómez-Torres, Marina; Yapici, Ismail; Gulcin, Ilhami; Yildiztugay, Evren
This study was undertaken to examine, for the first time, the antioxidant and enzyme inhibitory properties of several extracts obtained from the aerial parts of Teucrium scordium subsp. scordioides (Schreb.) Arcang (family: Lamiaceae). Among the extracts, the EtOH extract contained the highest total phenolic (89.96 mg GAE/g) and flavonoid (45.74 mg RE/g) contents. Phenylethanoid glycosides were predominant, particularly in the ethanol and aqueous extracts, and teucroside/forsythoside B and verbascoside/forsythoside A were tentatively identified as the major compounds. EtOH and 70% EtOH extracts showed comparable (p > 0.05) anti-DPPH activity (201.89 and 188.52 mg TE/g), Cu++ (562.81 and 547.88 mg TE/g), and Fe+++ (329.13 and 320.08 mg TE/g) reducing capacities. The EtOH extract showed the best antityrosinase activity (72.00 mg KAE/g). The EtOAc extract inhibited human carbonic anhydrase (CA) isoenzymes I and CAII (IC50 = 26.86 and 65.37 mu g/mL, respectively). Complementary in silico analyses of the major phenylethanoid and flavonoid glycosides supported their possible multitarget interaction patterns and identified the Forsythoside A-BChE complex as a computationally favorable model for future experimental validation. Overall, these findings indicate that T. scordium subsp. scordioides may represent a natural source of antioxidants and enzyme inhibitors for use in different health-promoting formulations.
- MakaleAçık Erişim2026Scopus SJRQ2Multi-joint isokinetic strength profiling as a predictor of vertical jump performance in elite freestyle wrestlers A cross-sectional principal component analysis
Sever, Ozan; Ceylan, Halil Ibrahim; Dhahbi, Wissem; Yilmaz, Hasan Huseyin; Özdemir, Kubra; Yazici, Ahmet Gokhan; Jalalov, Ferhad; Günay, Ahmet Rahmi; Bayrakdaroglu, Serdar; Stefanica, Valentina
Wrestling requires coordinated lower-limb strength for explosive techniques. While isokinetic testing isolates joint-specific strength and countermovement jumps assess functional power, comprehensive multi-joint assessments with advanced factor analysis remain unexplored in elite wrestlers. Twenty-one national-level male freestyle wrestlers (22.3 +/- 2.8 years; 76.2 +/- 14.7 kg) completed cross-sectional neuromuscular assessments. Isokinetic concentric strength testing at 60 degrees/s evaluated hip, knee, and ankle joint functions bilaterally using an Isomed 2000 dynamometer. Vertical jump power was assessed through countermovement jumps under bilateral and unilateral conditions using the Optojump system. All strength and power variables were normalized to fat-free mass determined via air displacement plethysmography. Statistical analyses included Pearson correlations with Benjamini-Hochberg correction, stepwise multiple regression, and principal component analysis. Bilateral jump performance correlated strongly with knee extension (R = 0.798, P <.001) and hip extension strength (R = 0.664, P =.001), with combined predictors explaining 68.8% of variance (F-2,F-18 = 19.8, P <.001). Principal component analysis identified a primary extensor factor (hip and knee extension, 52.6% variance) and an auxiliary factor (ankle plantar flexion and hip adduction, 19.0% variance). Unilateral jump models demonstrated lower explanatory power (dominant: 39.8%, non-dominant: 25.7%). Multi-joint isokinetic strength assessment, particularly hip and knee extension capacity, provides a robust prediction of vertical jump performance in elite wrestlers. The identified primary extensor strength factor represents a fundamental neuromuscular capacity underlying explosive lower-limb function, supporting targeted strength development strategies for wrestling-specific performance enhancement.
AtıfScopus12WoS12OpenAlex11İncele - MakaleAçık Erişim2026Scopus SJRQ1Beyond the fruit: phenolic composition, cytotoxicity, antioxidant, and multi-enzyme inhibitory activity of twig and leaf extracts from four understudied Turkish Rosa species
Salehi, Hajar; Terzic, Milena; Ak, Gunes; Zengin, Gokhan; Swiatek, Lukasz; Salwa, Kinga; Yapici, Ismail; Gulcin, Ilhami; Yildiztugay, Evren; Lucini, Luigi
The phytochemical profile and multi-target bioactivity of four Turkish Rosa species, R. canina, R. hemisphaerica, R. horrida, and R. pulverulenta, were evaluated across vegetative organs (twigs and leaves) and three solvent polarities (ethyl acetate (EA), methanol (MeOH), water), in total 24 extracts. Untargeted Ultra-High-Performance Liquid Chromatography-Quadrupole Time-of-Flight Mass Spectrometry (UHPLC-QTOF-MS) metabolomics, along with total phenolic (TPC) and flavonoid (TFC) content, six antioxidant assays and inhibition of seven enzymes were determined. Twig EA extracts displayed unexpectedly high TPC (83-105 mg gallic acid equivalent (GAE) per g) and TFC (35-47 mg rutin equivalent (RE) per g), indicative of selective aglycone flavonoid enrichment. The phenolic profiles identified 337 putative compounds, of which 60.84% belonged to the flavonoid class. The semi-quantitative analysis also indicates that methanol and water extracts had higher quantities of glycosylated flavonoids and phenolic acids, while EA extracts were richer in lignans, especially R. horrida-leaf-EA (1743.25 & micro;g SE per g DW), and polyphenols. In enzyme inhibition assays, EA extracts demonstrated consistent multi-target activity: AChE inhibition (up to 2.49 mg galantamine equivalent (GALAE) per g), BChE inhibition (up to 4.44 mg GALAE per g), tyrosinase inhibition (up to 63.58 mg kojic acid equivalent (KAE) per g), alpha-amylase inhibition (up to 0.72 mmol acarbose equivalent ACAE per g), and carbonic anhydrase inhibition (CA I IC50 as low as 12.17 & micro;g mL-1). The R. hemisphaerica-twig-EA extract showed highly selective cytotoxic activity against A375 cells, with a 50% cytotoxic concentration (CC50) of 3.22 & micro;g mL-1 and an SI of 73.95, compared to VERO cells. This is the first report of carbonic anhydrase inhibition, BChE-selective activity, cytotoxicity, and comprehensive enzyme-inhibitory data for R. hemisphaerica, R. horrida, and R. pulverulenta. These findings reframe the phytopharmacological potential of Turkish Rosa species beyond their traditionally studied fruit.
- MakaleAçık Erişim2026Scopus SJRQ1Positive attitudes toward and perceived importance of wearable display technology as an effective learning tool among nursing students: Turkish validity and reliability study
Aydin, Aydanur; Mese, Sevinc; Ay, Ali; Sezer, Hale; Rizalar, Selda; Güler, Sevil; Gürsoy, Ayla
Objective This research aimed to adapt Positive Attitudes Toward and Perceived Importance of Wearable Display Technology (PATPIWDT) as an Effective Learning Tool Among Nursing Students into Turkish and to examine the validity and reliability of its translation.Methods This methodological study included 698 nursing students recruited via convenience sampling. Construct validity was evaluated using Confirmatory Factor Analysis (CFA) with the Maximum Likelihood (ML) estimation method. Internal consistency was assessed using Cronbach's Alpha and McDonald's Omega coefficients.Results The model demonstrated excellent fit according to the confirmatory factor analysis results. The CFA results for the Positive Attitudes subscale indicated a good model fit (CMIN/DF = 4.79, GFI = 0.93, CFI = 0.97, RMSEA = 0.07, SRMR = 0.03). For the Perceived Importance subscale, the single-factor structure showed acceptable fit indices (CMIN/DF = 5.82, GFI = 0.98, SRMR = 0.03). As a result of examining the standardized loadings of the items, it was seen that the item factor loadings were 0.40 and above, indicating sufficient factor loading. Cronbach's alpha coefficients were 0.91 for the positive attitudes subscale and 0.84 for the perceived importance subscale. The respondents also demonstrated an above-average overall score, with a mean of 3.40 (SD = 0.69).Conclusion The Turkish version of the scale provides a dependable measure of nursing students' positive attitudes toward wearable screens and how important they consider this technology for future educational use.
- MakaleAçık Erişim2026Scopus SJRQ2Canal Hypersurfaces Generated by Pseudo-Null Curves with Bishop Frame in Lorentz-Minkowski 4-Space
Kazan, Ahmet; Kazan, Sema; Gur Mazlum, Sumeyye; Karaca, Emel; Altin, Mustafa; Grilli, Luca
In this paper, we deal with the canal hypersurfaces that are formed as the envelope of a family of pseudo-hyperspheres or pseudo-hyperbolic hyperspheres with centers lying on a pseudo-null curve with Bishop vector fields in four-dimensional Lorentz-Minkowski space. We give main theorems which contain the parametric expressions of these canal hypersurfaces along with their Gaussian, mean, and principal curvatures and important geometric characterizations. We also provide these characterizations for tubular hypersurfaces. Finally, we construct an example to allow for better understanding and comprehension of the results.
- MakaleAçık Erişim2026Scopus SJRQ1Process Optimization of Spray-Dried Aquafaba and Comparison with Freeze-Drying: Techno-Functional Performance and Structural Attributes
Tunc Odabas, Merve Tugce; Saricaoglu, Furkan Turker; Parlak, Mahmut Ekrem; Akdogan, Arda; Odabas, Halil Ibrahim; Gündogdu, Engin; Simsek, Senay; Atalar, Ilyas
This study aimed to optimize the spray-drying (SD) process for aquafaba and compare the physical and techno-functional properties of the resulting powder with those of its freeze-dried (FD) counterpart. A Box-Behnken design was employed to evaluate the effects of inlet air temperature (150-190 degrees C), air speed (3.5-4.3 m/s), and feed flow rate (0.3-0.5 L/h) on 14 quality responses. The optimized SD conditions were determined to be an inlet air temperature of 189 degrees C, an air speed of 4.2 m/s, and a feed flow rate of 0.3 L/h. Validation experiments demonstrated that the developed models had high predictive capacity, with only a small discrepancy (0.56-5.88%) between the predicted and experimental values. Comparative analysis showed that the optimized SD powder had significantly lower moisture content (2.47%) and water activity (0.18) than the FD powder (3.51% and 0.34, respectively), indicating superior storage stability. In addition, the SD powder exhibited greater whiteness (82.37), higher water solubility (88.44%), and substantially greater foaming capacity (266.67%) than the FD sample (243.33%). Although the FD powder demonstrated better wettability and water absorption capacity because of its porous structure, FTIR spectroscopy and protein secondary structure analysis confirmed that SD preserved the functional integrity of aquafaba. Specifically, SD induced a transition from disordered random-coil structures to more ordered beta-sheet and beta-turn configurations, thereby improving foaming performance. Overall, these findings indicate that optimized spray-drying is a highly efficient and industrially scalable alternative to freeze-drying for producing functional aquafaba powder for use as a plant-based egg substitute.
- MakaleAçık Erişim2026Scopus SJRQ1Thermosonication improves the bioactive properties and in vitro bioaccessibility of broccoli juice through integrated RSM and metaheuristic optimization
Arpa Zemzemoglu, Tuba Eda; Tokatli Demirok, Nazan; Türkol, Melikenur; Gürfidan, Remzi; Kilim, Oguzhan; Tokatli, Nazli; Yikmis, Seydi; Mohamed Ahmed, Isam A.; Aljobair, Moneera O.; Yinanç, Abdullah
Broccoli juice is highly nutritious, containing phenolic compounds, chlorophyll derivatives, antioxidants, and other biologically active phytochemicals; however, conventional thermal processing may reduce their stability and bioaccessibility. The aim of this study was to analyse the impact of thermosonication on the following properties of broccoli juice: bioactivity, antioxidant capacity, phenolic profile and in vitro bioaccessibility. Thermosonication conditions were optimized using Response Surface Methodology (RSM) integrated with the Gray Wolf Optimizer (GWO) and Particle Swarm Optimization (PSO) algorithms. Broccoli juice samples were subjected to conventional pasteurization and thermosonication under different processing conditions, and total chlorophyll, ascorbic acid (AA), ferric reducing antioxidant power (FRAP), total phenolic content (TPC), and individual phenolic compounds were evaluated. Digestive stability and post-digestion bioaccessibility were also assessed using a standardized in vitro gastrointestinal digestion model. The developed quadratic models exhibited high statistical significance for TPC and FRAP responses (p < 0.001), with coefficients of determination (R2) of 0.9949 and 0.9853, respectively. The optimum thermosonication conditions were identified as 40 degrees C, 6.75 min, and 64.04% amplitude, under which experimentally validated FRAP and TPC values reached 12.86 mmol TE/L and 149.77 mg GAE/100 ml, respectively. HPLC-DAD analysis showed that gallic acid and naringin were the pre-dominant phenolic compounds, and that thermosonication promoted greater phenolic retention than conventional pasteurization. In vitro digestion results demonstrated that thermosonicated broccoli juice maintained significantly higher levels of TPC, FRAP, chlorophyll, and AA throughout gastrointestinal digestion, with higher TPC recovery (30.45%) than pasteurized samples (26.22%), indicating improved post-digestion bioaccessibility of phenolic compounds. Similar improvements were observed for antioxidant capacity and chlorophyll retention. Furthermore, PSO and GWO optimization results showed strong agreement with RSM predictions, confirming the robustness of the proposed optimization strategy. Overall, thermosonication was shown to effectively and sustainably enhance the functional quality, antioxidant properties, phenolic stability, and digestive bioaccessibility of broccoli juice.
AtıfScopus1WoS1OpenAlex1İncele - Doktora TeziAçık Erişim2025Mahmûd bin Muhammed el-Arrānî'nin el-Kâfiyetu fî Şerhi'ş-Şâfiye kitabındaki metodolojisi ve diğer âlimlere karşı tutumu
İntigam Mammadov
13-14. yüzyıllarda Azerbaycan'da farklı ilim dallarında çalışmalar yapılmış, bu çalışmaları yapan âlimler birçok talebe yetiştirmiş ve değerli eserler yazmışlardır. Bu dönemde yaşayan âlimler, hadîs, tefsîr, fıkıh gibi İslâmî ilimler yanında Arap dili ve belagâtine dair de birçok eserler kaleme almış, İslâm medeniyetine ve ilmî mirâsına katkıda bulunmuşlardır. Bu âlimler hakkında günümüze kadar çeşitli araştırmalar yapılmış, Arap dilbilimi ve edebiyatına dair yazdıkları ilmî eserler ele alınmıştır. Ancak bu konudaki çalışmaların yeterli olduğu söylenemez. Gün yüzüne çıkarılmayı bekleyen âlimlerden biri de Azerbaycan'ın Arrân bölgesinde yaşayan ve teze konu olan Mahmûd bin Muhammed el-Arrânî es-Sekînenî'dir. Sekînenî'nin, İbnü'l-Hâcib'in eş-Şâfiye isimli sarf kitabına yazdığı el-Kâfiye isimli bir şerh kitabı vardır. Bu araştırmada el-Arrânî'nin hayatı, el-Kâfiyetü fî Şerhi'ş-Şâfiye adlı şerhinin metodolojisi, zamanında ve kendisinden önce yaşayan dilbilimcilere karşı tutumu ve Arap dilbilimindeki yeri ve önemi üzerinde durulmuştur. Tez, "Giriş", dört ana bölüm ve "Sonuç"tan oluşmaktadır. "Giriş"te araştırmanın konusu, önemi, amacı ve yöntemine, sarf ilmînin tarihine, gramer ekollerine, Basra ve Kûfe ekolleri arasındakı ihtilâfın temellerine dair bilgiler verilmîş, birinci bölümde İbnü'l-Hâcib ve Mahmûd b. Muhammed el- Arrânî'nin hayatı, eserleri ve ilmî şahsiyetleri, ikinci bölümde Mahmûd b. Muhammed el- Arrân'inin el-Kâfiyetü fî Şerhi'ş-Şâfîye isimli kitabının metodolojisi, üçüncü bölümde Mahmûd b. Muhammed'in önceki gramer âlimlerine karşı tutumu, dördüncü bölümde ise eş- Şâfîye kitabının müellifî İbnü'l-Hâcib ve diğer şârihleri ile ilgili tutumu ele alınmıştır. "Sonuç" bölümünde ise bu araştırmada elde edilen tespitler doğrultusunda hükümlere ulaşılmıştır. Tezin amacı bu âlim ve araştırmaya konu olan eseri hakkında henüz az olan bilgileri zenginleştirmek, eserden hareketle bu şahsiyetin ilmî görüşlerini ve metodolojisini ortaya çıkarmaktır.
- Doktora TeziAçık Erişim2025Dijital pazarlama bağlamında ürün kişiselleştirmenin marka sadakatine etkisinde marka faydası, marka özdeşleşmesi ve algılanan kalitenin aracılık rolü
Halil Hakdan Öz
Dijitalleşme ile birlikte tüketici davranışları önemli bir dönüşüm geçirmiş ve kişiselleştirme odaklı pazarlama stratejileri tüketici ve marka ilişkisinin yeniden şekillenmesine yol açmıştır. Bu çalışmada dijital pazarlama bağlamında ürün kişiselleştirmenin marka sadakati üzerindeki etkisi incelenmiş ve bu etkide algılanan kalite, marka özdeşleşmesi ve marka faydasının aracı rolleri bütüncül aracılık modeli çerçevesinde değerlendirilmektedir. Araştırmanın evrenini Türkiye'deki elektrikli araç kullanıcıları oluşturmaktadır. Söz konusu evren içerisinden kolayda örnekleme yöntemine göre seçilen 443 elektrikli araç sahibinden anket tekniği ile veriler elde edilmiştir. Araştırma bulguları ürün kişiselleştirmenin marka sadakati üzerinde doğrudan bir etkisinin olduğunu ortaya koymakla birlikte bu etkinin sınırlı olduğunu algılanan kalitenin, marka özdeşleşmesinin ve marka faydasının söz konusu etkide anlamlı ve güçlü bir aracı rolü olduğunu göstermektedir. Modelde elde edilen aracılık yapısı ürün kişiselleştirmenin sadakati artırma mekanizmasının psikolojik ve algısal süreçler aracılığı ile işlediğini vurgulamaktadır. Ürünlerin bireysel tercihler dikkate alınarak üretilmesi tüketicinin performans beklentisini, kalite algısını yükseltmekte, marka ile kurulan kimlik temelli ilişkiyi güçlendirmekte ve markadan algılanan toplam faydayı artırmaktadır. Söz konusu süreçlerin birlikte çalışması ürün kişiselleştirme uygulamalarının marka sadakatinin oluşumunda kritik bir rol üstlendiğini göstermektedir. Çalışmada ürün kişiselleştirme çoklu aracılık modeli ile literatüre teorik açıdan katkı sunmaktadır. Ayrıca elektrikli araç sektöründe tüketici davranışlarını anlamaya yönelik güncel ve pratiğe dönük iç görüler barındırmaktadır. Çalışma bulguları işletmelerin ürün kişiselleştirme faaliyetlerini sadece ürünlerin fonksiyonel özellikleri seviyesinde değil, değer oluşturma, kullanıcı deneyimi tasarımı ve marka iletişimi doğrultusunda bütüncül bir yaklaşımla ele alınması gerektiğini ortaya koymaktadır.
- Yüksek Lisans TeziAçık Erişim2025Avrupa'ya Arap göçünün nedenleri, süreci ve gelecek perspektifi
Aliaa Albrrı
Bu yüksek lisans tezi, Arapların Avrupa'ya göçünü çok katmanlı bir yapı perspektifinden incelemektedir. Çalışma, göç dinamiklerini açıklamak için Orta Doğu'daki sosyal, siyasal ve ekonomik yapıları analiz etmektedir. Sosyal Yapı bağlamında, keskin sınıfsal eşitsizlikler, kimlik temelli ayrımcılık ve kırsal-kentsel bölünmeler dışlanmışlık hissi yaratmaktadır. İletişim devrimiyle artan göreli yoksunluk farkındalığı, özellikle genç nesilleri daha iyi bir yaşam arayışıyla Avrupa'ya yönlendirmektedir. Siyasal Yapı açısından, demokratik yönetişimin yokluğu, güvenlik elitlerinin egemenliği ve devlet kurumlarının aşınması toplumsal güveni zayıflatmıştır. Suriye iç savaşı ve Irak işgali gibi silahlı çatışmalar kitlesel zorunlu göç olgusunu tetiklemiştir. Bu siyasal kriz, göçü varoluşsal bir eylem haline getirmiştir. Ekonomik Yapı yüksek işsizlik, zayıf sanayileşme ve rant ekonomisine bağımlılıkla karakterizedir. Göç-havale modeli aracılığıyla Arap iş gücü köken ülkeleri desteklemekte, ancak bu ülkelerin Batı ekonomilerine bağımlılığını pekiştirmektedir. Neoliberal dönüşümler gelir uçurumunu derinleştirerek göçü rasyonel bir ekonomik seçenek yapmıştır. Tez, Golan Tepeleri örneğini 1967 işgali sonrası sistematik tehcir ve yıkımla birlikte tarihsel bir zorunlu göç vakası olarak incelemektedir. Almanya, Fransa ve İsveç'teki Golanlı diasporaların deneyimleri, entegrasyon ve kimlik inşası açısından analiz edilmiştir. Araştırma, göçü yalnızca bir nüfus krizi değil, modern çağın karmaşık bir olgusunun yansıması olarak değerlendirmektedir.
- Yüksek Lisans TeziAçık Erişim2025Farklı atletizm disiplinlerinde yarışan sporcuların atletik profillerinin incelenmesi
Sadun Ecevit
Bu çalışmanın amacı, farklı atletizm disiplinlerinde yarışan sporcuların atletik profillerinin incelenmesi amaçlanmıştır. Araştırmaya Adana ilinde aktif olarak antrenman yapan 33 erkek ve 16 kadın olmak üzere toplam 49 atlet katılmıştır. Katılımcılara dikey sıçrama testi, dinamik denge testi ve el pençe kuvveti ölçümleri uygulanmıştır. Elde edilen veriler SPSS 25 paket programında analiz edilmiş olup, gruplar arası farkların belirlenmesinde ANOVA, değişkenler arası ilişkilerin saptanmasında ise Pearson korelasyon testi kullanılmıştır. Araştırma sonuçlarına göre, atma branşındaki sporcuların zirve güç değerleri sprint ve atlama branşlarındaki sporculara kıyasla istatistiksel olarak anlamlı düzeyde daha yüksek bulunmuştur (p<0,05). Dinamik denge performansı açısından branşlar arasında anlamlı bir fark saptanmamıştır (p>0,05). Kadın sporcularda atma branşının hem sağ hem sol el pençe kuvveti değerlerinin sprint ve atlama branşlarına göre anlamlı düzeyde daha yüksek olduğu tespit edilmiştir (p<0,05). Korelasyon analizleri, sağ ve sol el pençe kuvvetleri arasında yüksek düzeyde pozitif ilişki (r=0,908) olduğunu göstermiştir. Elde edilen bulgular neticesinde, atletizm branşlarının fiziksel performans üzerinde branşa özgü farklılıklar oluşturduğu belirlenmiştir. Atma branşı, zirve güç ve el pençe kuvveti açısından üstünlük gösterirken, fiziksel parametreler arasındaki anlamlı ilişkiler antrenman programlarında bütünsel bir yaklaşımın gerekliliğini ortaya koymaktadır. Anahtar Kelimeler: Atletizm, Cinsiyet, Dinamik denge, Dikey sıçrama, El pençe kuvveti
- Yüksek Lisans TeziAçık Erişim20257-14 yaş kadın voleybolcularda 8 haftalık postür egzersizlerinin dikey sıçrama ve postür üzerine etkisi
Çağla Aksu
Bu çalışmanın amacı, 8 haftalık postür egzersizlerinin farklı yaş gruplarındaki voleybolcularda dikey sıçrama performansı ve postür yapısı üzerindeki etkilerini incelemektir. Çalışmamıza 7–14 yaş aralığında toplam 84 voleybolcu (deney grubu n=45, kontrol grubu n=39) gönüllü olarak katılmıştır. Deney grubuna 8 hafta boyunca planlı bir postür egzersiz programı uygulanırken, kontrol grubuna herhangi bir ek egzersiz programı uygulanmamıştır. Her iki gruba ait ön test–son test ölçümlerinde; boy, kilo, iskelet kas ağırlığı , vücut yağ oranı, dikey sıçrama yüksekliği, postür analizi ve güç değişkenleri değerlendirilmiştir. Verilerin analizinde Paired Samples T-Testi, Independent Samples T-Testi ve Wilcoxon testleri kullanılmıştır. Elde edilen bulgular, deney grubundaki sporcuların kilo (p=0.00), iskelet kas ağırlığı (p=0.00), dikey sıçrama (p=0.006), postür analizi (p=0.00), ve anaerobik güç (p=0.001) parametrelerinde ön test son test değerleri istatistiksel olarak incelendiğinde anlamlı farklılıklar bulunmuştur (p<0.05). Vücut yağ oranında (p=0.131) azalma eğilimi gözlenmiş, ancak bu fark istatistiksel olarak anlamlı düzeyde bulunmamıştır (p>0.05). Kontrol grubunda ise istatistiksel olarak yalnızca postür analizi (p=0.015) ve anaerobik güç (p=0.025) parametrelerinde anlamlı farklılıklar bulunmuştur. Bu sonuçlar, 8 haftalık postür egzersizlerinin postür ve anaerobik gücü artırmada etkili olduğunu göstermektedir(p<0.05). Sonuç olarak, uygulanan postür egzersizi programı, voleybolcularda postürü düzelterek dikey sıçramaya ve anerobik güce olumlu katkı sağlamaktadır. Bulgular, erken yaşta planlı ve sistematik egzersizlerin hem postüral kontrolün korunması hem de sportif performansın artırılması açısından önemli olduğunu ortaya koymaktadır. Aynı zamanda, özellikle spor yapan ve postür bozukluğu bulunan bireylerde postürün iyileştiği, buna bağlı olarak da günlük yaşam kalitesinin arttığını söyleyebiliriz. Anahtar Kelimeler: Postür, postür egzersizleri, voleybol, dikey sıçrama, anaerobik güç
- Yüksek Lisans TeziAçık Erişim2025Kalehisar ören yeri'ndeki olası sarnıç yapısının jeofizik yöntemlerle araştırılması
Elifnur Baydın Kavaklı
Arkeolojik kazılarda karşılaşılan en büyük zorluklardan biri, yeraltında gömülü bulunan yapı kalıntılarının lokasyon ve derinlik bilgilerinin tam olarak bilinmemesidir. Bu durum beraberinde hem ekonomik olarak hem de kazı süresinin artması nedeniyle kazı ekibine büyük bir yük getirmektedir. Yeryüzünden tahribatsız bir şekilde uygulanabilen arkeojeofizik yöntemler, zaman ve maliyet açısından kolaylık sağlamaktadır. Son yıllarda teknolojinin gelişimine paralel olarak alet tasarımında yaşanan yenilikler ve yorumlama-modelleme programlarının geliştirilmesiyle jeofizik yöntemlerin arkeolojik çalışmaların doğal bir parçası haline getirmiştir. Bu tez çalışmasında, Çorum ili Alaca İlçesinde bulunan Kalehisar Ören Yeri araştırma sahası olarak belirlenmiştir. Kalehisar Ören Yeri'nde önümüzdeki yıllarda kazı planlaması yapılan ve eski bir sarnıç yapısının olduğu düşünülen bir sahada, jeofizik yöntemlerden, yer radarı (GPR), elektrik özdirenç tomografi (ERT), manyetik yöntemlerin kullanıldığı bir arkeojeofizik çalışma yaparak, bu alanda gömülü halde bulunan olası sarnıç yapısı ve buna bağlı yapıların tespit edilmesi amaçlanmaktadır. Manyetik yöntemden güneybatı – kuzeydoğu yönelimli yaklaşık 5-8 metre genişliğinde bir yapı olduğu ve bu yapıya bağlı güneydoğu yönünde daha küçük yapılar olduğu belirlenmiştir. ERT profilleri altında gözlemlenen yapıların derinliklerinin 1.5-2 metre civarında gözlenmiş olup GPR verilerinden gözlemlenen anomalilerin 0.3 m ile 2-5 metre derinliklerinde olduğu gözlemlenmiştir. Böylece bu tez çalışmasından elde edilen sonuçlar ile gömülü halde bulunan arkeolojik kalıntıların yerleri, yönelimleri ve derinlikleri gibi özellikleri tespit edilmiştir. Bu tez çalışmasının ileride yapılması planlanan kazı çalışmasına hem ekonomik katkı hem de zamandan tasarruf sağlamak suretiyle bir yol gösterici olacağı düşünülmektedir.
