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
Exploration of natural radioactivity and radiological hazards due to radioisotopes in some marble commercially sold in Türkiye
(Elsevier, 2025) Dizman, Serdar
Natural stones have been the most important material used in both the building sector and art since ancient times. One of the natural stones frequently used in human life is marble. Natural stones contain various concentrations of natural radionuclides due to their underground origin. Therefore, it is critical to determine the radioactivity in natural stones, which are indispensable for human life. In this context, the levels of natural radioactivity (226Ra, 232Th and 40K) in commercial marbles collected from different regions of Türkiye were determined, and potential radiological hazards were evaluated. The natural radioactivity levels in the marble samples were measured using high-purity germanium detector system (HPGe). The radioactivity concentrations of 226Ra, 232Th and 40K in the marble samples range from 0.38 ± 0.11 to 63.38 ± 2.13 Bq/kg for 226Ra, from 3.67 ± 1.30 to 112.20 ± 3.36 Bq/kg for 232Th, and from 8.13 ± 2.21 to 961.06 ± 17.36 Bq/kg for 40K. Also, some radiological hazard parameters (Raeq, Hex, Iγ, ADR, AED and CR) for marble samples were calculated and evaluated. Based on the results obtained, this study indicates that the marble samples examined can be used safely in construction and will not create a significant radiological hazard when used anywhere.
Investigating the effect of discipline-based art education training on pre-service arts teachers' teaching self-efficacy
(Wiley, 2025) Demirel, İrfan Nihan; İslamoğlu, Hakan
This study examined the effect of Discipline-Based Art Education (DBAE) training on the teaching self-efficacy of pre-service visual arts teachers. A mixed-methods approach was used, combining a single-group pre-test post-test quasi-experimental design with qualitative data analysis. Over two semesters, 24 pre-service teachers took part in a DBAE-enhanced training programme integrated into the “Visual Arts Teaching I and II” courses. Quantitative results showed significant increases in self-efficacy in the areas of preparation, teaching, and diversity. Qualitative data supported these findings, revealing improvements in professional skills, attitudes, and content knowledge. Participants demonstrated high proficiency in applying DBAE's core disciplines—art history, criticism, aesthetics, and production—into lesson planning and instructional materials. Despite difficulties in more abstract areas like aesthetics and criticism, notable progress was achieved. The results emphasise DBAE's potential to boost self-efficacy and pedagogical skills in art education, recommending its inclusion in teacher training programmes to promote holistic and reflective teaching practices.
Turkish while-in-bed smartphone-use-induced sleep procrastination scale (TWSSPS): scale development and validation in adolescents
(SAGE Publications Inc., 2025) Kabadayı, Fedai
Despite a steady increase in while-in-bed smartphone use among adolescents worldwide, there has been a lack of research on while-in-bed smartphone use. The present study focused on measuring while-in-bed smartphone-induced sleep procrastination and aimed to evaluate the psychometric properties of the Turkish while-in-bed smartphone-induced sleep procrastination scale for adolescents. The research was designed as a mixed-method study. A total of 857 Turkish adolescents were included in different phases of the study. The results showed that the 3-dimensional structure and the 22-item instrument were validated for Turkish adolescents. The instrument provided high-reliability scores. The results suggest that this instrument is useful for assessing while-in-bed smartphone-use-induced sleep procrastination in adolescents.
Two-decade trends in MASLD and its complications in the Middle East and North Africa (2010–2021)
(Wiley, 2025) Younossi, Zobair M.; Paik, James M.; Yılmaz, Yusuf; Kanat, Mustafa; El-Kassas, Mohamed; Al-Busafi, Said A.; AlQahtani, Saleh
Background The Middle East and North Africa (MENA) region is undergoing demographic shifts potentially increasing metabolic dysfunction-associated steatotic liver disease (MASLD) and its complications. We assessed MASLD prevalence and liver disease burden from 2010 to 2021.
Methods Data from Global Burden of Disease (GBD), United Nations Population Division and NCD Risk Factor Collaboration covering 21 MENA countries were used for annual percent change (APC) trends per Joinpoint regression. Regression modelling determined MASLD cirrhosis prevalence (compensated [CC]/decompensated cirrhosis [DCC]). Prevalence and mortality estimates were age-standardised (children and adults).
Results MENA region's population: progressively aged, increased (518-623 million), and experienced prevalence increases in adult diabetes (7.4%-12.1%), obesity (25.4%-31.3%) and MASLD (26.3% [117.97 million] to 27.7% [164.31 million]; APC = 0.47%; 95% CI, 0.35-0.59); steeper increase in adults >= 20 years (37.1%-41.0%; APC = 0.90%; 0.79-1.01). MASLD cirrhosis (0.22% [1.13 million] to 0.28% [1.73 million]; APC = 2.18%; 2.05-2.31), CC (0.20%-0.25%; APC = 2.24%) and DCC (0.020%-0.025%; APC = 2.23%) increased. Algeria, Iraq, Morocco and Turkey had the highest increases (APCs > 2.8% for both CC and DCC). MASH cirrhosis mortality (APC = 0.60%), and DALYs (APC = 0.47%) increased. MASH liver cancer prevalence (APC = 2.90%), incidence (APC = 2.90%), mortality (0.50-0.69 per 100 000; APC = 2.87%) and DALYs (APC = 2.51%) increased. Iran had the most rapid increases (APC > 6%) for all liver cancer outcomes; Egypt accounted for >= 50% liver cancer DALYs in 2021. Kuwait, West-Bank/Gaza and United Arab Emirates showed stable/declining trends.
Conclusions The prevalence of MASLD and associated complications (cirrhosis and liver cancer) increased substantially across the MENA region from 2010 to 2021, with variation across countries.
Investigation of the effect of changes in material values of FSPed Al5754 on contact mechanics
(Techno-Press, 2025) Sekban, Dursun Murat; Aktarer, Semih Mahmut; Özdemir, Mehmet Emin; Yaylacı, Ecren Uzun; Pirim, Ahmet Emre; Kolahchi, Reza; Yaylacı, Murat
The friction stir process (FSP), which is widely used on plate-type materials, was applied to AA5754 alloy, commonly used in engineering applications, under three different parameter settings. The effects of this process on the strength and elongation values were then evaluated. In the next stage, the material properties of the contact problem were designed using finite element-based (FEM) modeling techniques, and the effects of the changes in the strength and elongation values of the material on the contact stress and distance were determined. As a result of the examinations, it was determined that in all the changing parameters, the strength values increased compared to the initial state of the material after FSP. The elongation values may decrease or increase depending on the specific FSP parameters used. Regarding the contact stress and contact distance values, it was determined that the contact stress values increased in direct proportion to the strength of the material. It was determined that the changes in the elongation values of the material were more effective in the change of contact distances.
