Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan 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.
Güncel Gönderiler
Influence of regional artificial cavity layouts on flow boiling in micro heat sinks with stepwise-decreasing pin-fin heights
(Elsevier, 2026) Atci, Fatih; Markal, Burak; Evcimen, Alperen
Novel heat sink configurations and associated flow boiling physics were examined. Specifically, the influence of regional artificial cavity layouts on flow boiling in micro heat sinks with stepwise decreasing pin-fin heights was investigated. Four heat sinks with stepwise decreasing fin heights were compared. One of them has microcavities only in the downstream region (DPFH-1D), the other has microcavities both in middle and downstream regions (DPFH-2D), and another has microcavities in all regions (DPFH-3D). Additionally, the fourth one has no microcavities (DPFH) and was used as reference case. Under various heat fluxes (212 – 462 kWm−2) and mass fluxes (151 and 222 kg m−2 s−1), tests were conducted at an approximately constant inlet temperature (≈77°C). DPFH-1D provided the best overall thermal performance and the highest two-phase heat-transfer coefficients, although DPFH-3D yielded slightly lower wall-superheat values at the two highest heating powers. The maximum heat-transfer-coefficient enhancements of DPFH-1D reached 286.2% and 528.4% at 151 and 222 kgm−2s−1, respectively. Despite producing the highest pressure drop, DPFH-1D’s PEC value remained above 1 throughout dataset, with a maximum of 3.49. Downstream microcavities most effectively promoted capillary liquid retention and surface rewetting, whereas upstream and middle microcavities provided limited additional benefits at low and moderate heat loads.
The effect of ergonomics education on musculoskeletal system, posture and ergonomic risk in university students
(SAGE Publications, 2026) Atalı, Gamze; Terzioğlu, Füsun
BackgroundMaintaining the correct posture is very important for students who spend most of the day at desks and tables.ObjectiveThis study aimed to determine the effect of ergonomics training given to university students on their musculoskeletal system, postural habits, and awareness, and ergonomic risk score evaluated by the REBA (rapid entire body assessment) method.MethodA total of 130 university students participated in the study. The students were divided into two homogenized groups: intervention (65) and control (65). Only the intervention group received ergonomics training. All students were administered a semi-structured sociodemographic questionnaire, Cornell Musculoskeletal Discomfort Questionnaire (CMDQ), and Postural Habits and Awareness Scale (PHAS) at the beginning of the study. The Rapid Whole Body Assessment (REBA) was used to assess ergonomic risk. Ergonomics training was given to the intervention group. In the evaluation of static endurance of the core muscles, the trunk flexor endurance test, the trunk extensor endurance test, and the time spent in the right-left lateral bridge test positions were calculated. The evaluations were repeated immediately after the training and 1 month after.ResultsFollowing the training, no statistically significant differences were found between the CMDQ, PHAS, and core muscle endurance measurement groups. Additionally, ergonomics training was effective in reducing regional musculoskeletal complaints, decreasing ergonomic risk scores, and enhancing positional awareness.ConclusionErgonomics training should be utilized to gain correct posture habits and reduce musculoskeletal disorders.
Contribution to floral structure and palynological features of Turkish Periplocoideae and Asclepiadoideae taxa
(BioMed Central, 2026) Güven, Seher; Makbul, Serdar; Sarıkaya, Eyüp; Aydoğmuş, Duygu; Coşkunçelebi, Kamil
Background: The Apocynaceae are characterized by highly specialized flowers, including three derived structures, corona, gynostegium and pollinarium, which play an important role in explaining the evolutionary relationships among the major groups of the family. The floral morphology and microstructure of pollinaria in pollinia-bearing subfamilies, Periplocoideae and Asclepiadoideae, are not well understood. In the present study, we examined the detailed floral and pollen characters of six species from Türkiye-Asclepiadoideae: Araujia sericifera Brot., Cionura erecta (L.) Griseb., Cynachum acutum L. and Gomphocarpus fruticosus (L.) W.T.Aiton; Periplocoideae: Periploca gracilis Boiss. and P. graeca L.-using light and scanning electron microscopy for taxonomic insights.
Results: Macro- and micromorphological observations were performed on both herbarium samples and fresh field specimens preserved in 70% ethanol. Floral and pollen descriptions were amended, and a dichotomous identification key was prepared for the studied taxa. Morphological and palynological traits were also analyzed numerically. Principal components analysis revealed that length of pedicel, sepal, petal and corona segment, pubescence of anther (hairy/glabrous), shape of stigma (unlobed/bifid), length of pistil, type of pollen aggregation (tetrad/pollinium), number of tetrad mass or pollinium per pollen translator (single/in pairs), pollen translator structure (receptacle + stalk + adhesive disc or corpusculum + caudicles), and pollen grain dimensions were diagnostically informative traits for distinguishing taxa at both subfamily and genus levels.
Conclusions: The dendrogram inferred from macro- and micromorphological floral and pollen traits generally agrees with the traditional subfamilial classification of the Periplocoideae and Asclepiadoideae. These findings offer insights into the evolution and diversification of pollinia-bearing Apocynaceae, and may reflect the role of key traits in reproductive strategies and ecological interactions.
Comparative evaluation of the performance of different AI chatbots in answering pediatric dentistry questions in the Turkish dental specialization exam
(BioMed Central, 2026) Sakın Ulubay, Sena
Background: Artificial intelligence-powered chatbots, whose use is becoming increasingly widespread, are frequently used in medicine and dentistry for tasks such as generating academic texts, student education, clinical diagnosis, and patient information. Given their inherent limitations, the accuracy of chatbot responses in the healthcare field is a crucial issue. Evaluating the performance of artificial intelligence in national examinations can provide objective data regarding its use as an educational support tool. This study aims to comparatively evaluate the performance of various artificial intelligence chatbots on questions from the pediatric dentistry section of the DUS (Dental Specialization Exam).
Methods: A total of 127 questions asked in the DUS in the field of pediatric dentistry between 2012 and 2021 were included in the study. The questions were divided into nine subject-area categories, two exam years, and two question types: clinical case-based and theoretical knowledge-based. The ChatGPT-5, ChatGPT-4o, Gemini 2.5 Pro, Gemini 2.5 Flash, Claude Opus 4, and Claude Sonnet 4 models were evaluated in the study. Descriptive data are presented as numbers and percentages. Statistical analyses were performed using Cochran's Q test (p < 0.05); pairwise comparisons were made using the McNemar test and Bonferroni correction.
Results: Gemini 2.5 Pro answered 93.7% of the questions correctly; ChatGPT-5 and Claude Opus 4 answered 88.9%, ChatGPT 4 and Gemini 2.5 Flash answered 87.4%, and Claude Sonnet 4 answered 83.4%. Gemini 2.5 Pro's performance in correctly answering questions was significantly higher than that of Claude Sonnet 4 (p = 0.001). No statistically significant differences were found in the chatbots' correct-answer performance when comparing by subject, year, and question type (clinical case and theoretical knowledge) (p > 0.05).
Conclusions: This study demonstrates that chatbots perform well at answering exam questions in pediatric dentistry and may serve aspromising supplementary educational tool.
Functional benefits of fermented sesame oilcake in the diet of nile tilapia, oreochromis niloticus: insights into immunity, oxidative status, and gut microbiota
(Wiley, 2026) Hoseini, Seyyed Morteza; Yousefi, Morteza; Afzali-Kordmahalleh, Alireza; Hoseinifar, Seyed Hossein; Abdollahpour, Hamed; Minaz, Mert
This study evaluated the effects of dietary inclusion of fermented sesame oilcake (FSOC) on growth performance, antioxidant responses, immune parameters, bactericidal activity, and gut microbial composition in juvenile Nile tilapia, Oreochromis niloticus. FSOC was produced by aerobic solid-state fermentation using Saccharomyces cerevisiae. Fish (5-month-old, 13.31 ± 0.73 g, all-male) were randomly distributed into three treatment groups and fed diets containing 0% (control [CTL]), 10% (S-10), or 20% (S-20) FSOC for 8 weeks. Growth performance, feed conversion ratio, and survival were not significantly affected by FSOC inclusion (p > 0.05). However, dietary FSOC significantly enhanced several immunological parameters, including lysozyme activity and total immunoglobulin (Ig) levels in plasma, liver, kidney, and skin mucus (p < 0.05). Antioxidant markers such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and reduced glutathione (GSH) were significantly elevated in hepatic and intestinal tissues of FSOC-fed fish, accompanied by a significant reduction in malondialdehyde (MDA) levels (p < 0.05), indicating improved oxidative status. Skin mucus from FSOC-fed tilapia exhibited significantly greater bactericidal activity against Aeromonas hydrophila and Streptococcus iniae. Gut gene expressions showed different patterns in the S-10 and S-20 treatments, as the S-10 treatment showed only an upregulation in tumor necrosis factor-a (tnf-α) expression, while the S-20 treatment showed upregulations in various anti-inflammatory, proinflammatory, antioxidant, and chaperon gene expressions. Additionally, gut microbiota analysis revealed that FSOC supplementation significantly increased the abundance of beneficial microbes (Saccharomyces sp., Lactobacillus sp., and Bacillus sp.) while reducing the presence of opportunistic pathogens (Aeromonas sp., Vibrio sp., and Streptococcus sp.). Overall, these findings suggest that FSOC is a promising functional feed ingredient capable of improving immune competence, oxidative resilience, and gut health in Nile tilapia without compromising growth.
