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 on the thermoelectric characteristics of the growth parameters of BiSeTe thin films
(Elsevier, 2026) Yüzüak, Gizem Durak; Yüzüak, Ercüment
This study systematically investigates the influence of magnetron sputtering parameters on the structural, electronic, and thermoelectric properties of 100 nm thick Bi2SexTe3-x thin films deposited on Si(100). The initial parameters for applied film deposition are used to set the x value. The films are fabricated with sputtering powers ranging from 30 to 100 W and pressures from 3 to 15 mTorr, with films grown under optimal conditions selected for post-deposition annealing at 523 K. A comprehensive characterization suite, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM), is used to establish direct correlations between processing, structure, and performance. XRD analysis reveals that increasing the sputtering pressure from 3 to 15 mTorr was critical for enhancing film crystallinity and promoting a strong (015) preferred orientation, while AFM showed a corresponding increase in average grain size from similar to 46 to similar to 60 nm via heat treatment (HT). EDS shows that films grown at 10 mTorr were almost certainly stoichiometric, but increasing the power to 15 mTorr caused tellurium deficiency. The films exhibited a power factor ranging from 2.5 to 2.8 mW m(- 1) K- 2 at 40 degrees C. HT improved the Seebeck coefficient from -115 mu V K- 1 to -140 mu V K- 1 and decreased the electrical resistivity by over 25 % through defect reduction and enhanced crystalline order. KPFM supported these findings, directly linking the crystallographic texture to the surface electronic structure and enhanced Seebeck effect.
Exploring middle school students' awareness of agricultural production and its decline in an agriculturally predominant city
(Routledge, 2025) Altun, Ebru; Tuncar, Elif
PurposeThe objective of this study is to gain insight into the level of awareness among 8th grade students regarding agricultural production, and its decline. The study examines the students' cognitive structures, their interpretation of the decrease in agricultural production, and the solutions they propose to address this decrease.Design/methodology/approachThe study, which was conducted as a case study, collected data from 223 eighth grade students living in urban, and district centers. The data collected was subjected to descriptive, and content analysis.FindingsThe study revealed that students predominantly perceive agricultural production as crop farming, neglecting livestock, fisheries, and forestry. They have misconceptions about the relationship between agriculture, and ecology. Additionally, students struggled to develop issue-based solutions to agricultural problems.Practical implicationsIntegrating agricultural education into middle school curricula through experiential learning could improve students' knowledge, and perceptions.Theoretical implicationsThe findings highlight the role of regional influences on students' awareness of agriculture, and emphasize the need for formal education to bridge knowledge gaps.Originality/valueThis study provides insight into middle school students' awareness of agricultural production in T & uuml;rkiye, highlighting the need to introduce agricultural education at an earlier stage.
Apigenin exerts a protective effect against paclitaxelinduced testicular toxicity
(Elsevier, 2025) Bay, E.B.; Altuntoprak, M.; Saydam, Faruk
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Comparison of the osteoporosis knowledge levels of physiotherapy students pre-post awareness training: a randomized controlled trial
(Galenos Publishing House, 2025) Tüfekçi, Bengisu; Kurt, tuğba Birben; Şekeroğlu, Ayşe Nur
Objective: This research seeks to answer the question of whether education on osteoporosis is more effective when delivered via video conferencing or through informational brochures. Materials and Methods: The sample of the study consisted of 223 physiotherapy and rehabilitation students. Students were divided into two groups (video group, brochure group) by stratified randomization method according to their achievement levels. Osteoporosis awareness training was conducted through an online video conferencing system and using informative brochures. The osteoporosis knowledge test-revised (R-OKT) was used to assess the level of osteoporosis knowledge and awareness. Results: While there was no significant difference between the brochure and video training groups in terms of R-OKT scale nutrition, exercise and total knowledge scores (p>0.05), it was observed that the post-training scores increased significantly in both groups compared to the pre-education scores (z>8.5, p<0.001). Statistically significant differences were found between grade levels in post-education nutrition (chi(2)=52.222, p<0.001), exercise (chi(2)=56.488, p<0.001), and total knowledge scores (chi(2)=62.863, p<0.001). Pairwise comparisons revealed that 2(nd)-year students had significantly higher scores than all other grade levels (p<0.05). Positive and statistically significant relationships were found between the students' grade point average and the scores of the R-OKT subscales both before and after the training (r=0.157-0.302, p<0.05). Conclusion: Current study showed that video education methods were as effective as traditional printed materials in increasing the level of knowledge and awareness about osteoporosis and that the effect of education may vary depending on class levels. The findings underscore the importance of providing early and well-structured osteoporosis education for future healthcare professionals, which is essential for the development of more effective preventive health strategies.
Stability analysis and optimization management of nanocomposites-reinforced panels using a thickness-dependent shear deformation theory and HDQM
(Techno-Press, 2025) Mohammad, Suleiman Ibrahim; Alenazi, Sultan Alaswad; Jadallah, Hanan; Al Oraini, Badrea; Vasudevan, Asokan; Elhadi, Khaled Mohamed; Yaylacı, Murat
Using the modified couple stress theory, this study investigates the nonlinear vibrations of a sandwich microshell composed of a functionally graded graphene platelets (FG-GPL)-reinforced core and two uniform outer skins, all simply supported. The analysis employs the first-order shear deformation shell theory alongside a nonlinear strain framework. The mechanical properties of the GPL-reinforced core are assumed to vary with thickness, utilizing the Halpin-Tsai model. Three distinct distribution patterns of GPLs throughout the thickness are examined. The microshell is subjected to thermal loading, facilitating the calculation of its temperature field across the thickness by applying the one-dimensional Fourier heat conduction equation, which accounts for thermal boundary conditions at both the inner and outer surfaces of the shell. The shell models incorporate shear deformation and rotary inertia, while geometric nonlinearity is addressed using the von Karman approach. The fundamental partial differential equations (PDEs) governing the system are derived using Hamilton's principle. These coupled PDEs are then transformed into a set of ordinary differential equations (ODEs) via the Galerkin method and solved using the multiple timescale method to obtain results. The findings are validated against existing literature, demonstrating a robust level of agreement. This study thoroughly examines the effects of various factors, including GPL weight fraction, thickness distribution patterns, material length scale parameters, core length, radius, and individual layer thickness on nonlinear frequency ratios, fundamental linear frequencies, and nonlinear frequencies.
