DSpace Arşivi :: Ana Sayfa

İstanbul Gelişim Üniversitesi Kurumsal Açık Erişim Arşivi

DSpace@Gelişim, İstanbul Gelişim Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.

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Enhanced Crocin Stability and Controlled Release in Saffron-Based Emulsions via Optimized Ultrafiltration
(SPRINGER, ONE NEW YORK PLAZA, SUITE 4600 , NEW YORK, NY 10004, UNITED STATES, 2026) Azarabadi, Negin; Özdemir, Feramuz
This study presents an integrated workflow to enhance crocin stability and controlled release in saffron-based emulsions through optimized ultrafiltration and double-emulsion encapsulation. Saffron extracts were standardized according to ISO 3632 and concentrated via ultrafiltration using a PESU membrane with a 1 kDa molecular weight cut-off. Under optimized conditions (4 °C, 2 bar, 80:20 permeate-to-retentate ratio), the crocin concentration increased 6.1-fold (7568.45 mg/L) with a total recovery of 97.8±2.1% and process losses below 3%. D-optimal mixture design identified the optimal W/O formulation (67% sunflower oil, 6% PGPR, 27% ultrafiltrated extract), which showed minimal droplet growth and superior color retention (R2=0.96, p< 0.05). The most stable W/O/W emulsion incorporated β-cyclodextrin (1.7%) and whey protein isolate (8%), maintaining 85.3±2.7% crocin retention and stable chromatic parameters over 35 days at 5–45 °C. First-order kinetic modeling revealed a degradation rate constant (k=0.012 day-1 at 45 °C), confirming temperaturedependent stability. This integrated process bridges laboratory optimization and potential industrial application, providing a reproducible and scalable platform for formulating saffron-derived functional food systems.
Analytic Function Classes Defined by Mittag–Leffler Inspired Poisson-Type Series
(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2026) Thangamani, Stalin; Baleanu, Dumitru; Authimoolam, Supprabha; Yousif, Majeed Ahmad; Abdeljawad, Thabet; Mohammed, Pshtiwan Othman
In this article, we introduce new subclass s𝑚 𝛼,𝛽,𝜆(𝛾) of univalent functions based on Mittag-Leffler function related to the distribution series within the unit disc U = {𝜁 ∈ 𝐶 ∶ |𝜁| < 1}. Further the fundamental properties such as growth, distortion, extreme points, convexity, close-to-convexity, starlike and coefficient inequalities have been estimated for the subclass. In addition, we consider an integral means of inequality for the subclass. This work bridges the gap between fractional integral operators and Poisson distribution series by incorporating both into a new subclass of univalent functions. This integrative approach provides the valuable insights into the applications of geometric function theory in signal and image processing.
The effect of synthetic 4A and 5A zeolite-based nitrogen capture systems on diesel engine performance and emissions
(PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2026) Hazar, Hanbey; Fırat, Selahattin Özgür; Sevinç, Hüseyin
In the study, a filtration system was designed using pressure swing adsorption (PSA) technique and synthetic zeolites and its effects on exhaust emissions and performance attributes of a diesel engine were investigated by integrating this system into the intake line. Synthetic 4A and 5A zeolites were used as adsorbent materials in the PSA unit. Tests were conducted on a single cylinder diesel engine operated at constant speed under variable load conditions. SEM and EDX analyses were performed to characterize the surface properties of the zeolites. According to the oxygen measurements obtained at the outlet of the filtration system, the 4A and 5A zeolites provided an air outlet containing oxygen at the rate of 25.8% and 27.36%, respectively. The most remarkable improvements in exhaust emissions and performance parameters were obtained with the 5A zeolite. The use of 5A resulted in reductions in carbon monoxide, hydrocarbon, smoke density, and brake-specific fuel consumption by 17.31%, 13.83%, 17.42%, and 4.18%, respectively. Conversely, nitrogen oxides, brake thermal efficiency, exhaust gas temperature, torque, engine noise and vibration increased by 15.37%, 4.61%, 7.04%, 4.42%, 1.4%, and 3.1%, respectively. In-cylinder peak pressure also increased by 5.33% with PSA. This study provides the first experimental integration of a PSA-based continuous oxygen-enrichment system using synthetic 4A and 5A zeolites into a diesel engine, demonstrating how zeolite type and microstructure influence oxygen concentration and combustion behaviour. The findings show that continuous on-board oxygen enrichment can enhance diesel engine performance while reducing most exhaust emissions.
Long Bone Ratios in the Thoracic and Pelvic Limbs of Domestic Cats (Felis Catus)
(Polskie Towarzystwo Nauk Weterynaryjnych, 2026) Kartal, Mehmet; Sefergi̇l, Şamil; Sabancı, Seyyid Said; Poradowski, Dominik; Düzgün, Oktay; Chrószcz, Aleksander; Onar, Vedat
In this study, indices and ratio calculations were performed using osteometric measurements of the long bones (humerus, radius, femur, tibia) of the thoracic and pelvic limbs in domestic cats. For this purpose, the bones of a total of 55 adult animals, comprising 33 males and 22 females, were used. Sexual differences were observed in osteometric measurements at a level of significance of p < 0.05, while no gender-related differences were observed in index values. The intermembrial and humerofemoral index values were determined to be 89.83 ± 3.22 and 94.42 ± 5.46, respectively, while the brachial and crural index values were determined to be 96.65 ± 3.54 and 106.55 ± 6.63, respectively. The intermembrial and humerofemoral indices obtained showed that the pelvic limbs of domestic cats were longer than the thoracic limbs. In domestic cats, both the thoracic and pelvic limbs had different activities in hunting, movement, and habitat strategies. A low brachial index indicated hunting manipulation and climbing movements requiring strength, while a high crural index and low intermembrial index supported jumping and agility capacities. The data obtained were believed to serve as a reference for veterinary practice and zooarchaeological approaches, in addition to understanding the habitat strategy of domestic cats in urban life.
Development of Bigels Using Citrus Fiber and Beeswax: Application in Cocoa Spread Formulation as PalmOil Alternative
(John Wiley and Sons Inc, 2026) Yılmaz, Ezgi Genç; Akçiçek, Alican; Kablan, Taylan; Özgölet, Muhammed; Karasu, Salih
In this study, bigel systems were developed as potential alternatives to palm oil in cocoa spreads. This study developed citrusfiber (CF)-based bigel systems as alternatives to palm oil in cocoa spreads. Bigels were formulated by combining hydrogels (HG)containing CF (5% and 7.5%) with olive oil oleogels (OG) structured using 10% beeswax at different HG:OG ratios (80:20, 50:50,and 20:80). All bigels exhibited higher storage (G′) and loss (G″) moduli than palm oil, indicating enhanced viscoelastic behavior.Increasing the oleogel fraction improved the structural integrity of the bigel network. Bigels containing 7.5% CF were incorpo-rated into cocoa spreads, where higher oleogel ratios increased the solid character (G′). All bigel-enriched cocoa spreads showedthixotropic behavior with lower deformation and higher structural recovery compared to palm oil-based spreads. Additionally,bigel addition improved temperature-dependent stability. These results demonstrate that CF-based bigels provide a compact,viscoelastic, and stable fat system, highlighting their potential as palm oil replacers in cocoa spread formulations.