Kırşehir Ahi Evran Üniversitesi Kurumsal Akademik Arşivi
DSpace@Kırşehir, Kırşehir Ahi Evran 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 etkisimi artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Genetic basis and multi-environment GGE-biplot evaluation of common bunt resistance in Turkish bread wheat landraces
(Springer Nature, 2026) Saratlı, Mehmet; Yıldız, Ayşe; Çat, Ahmet; Akan, Kadir
Türkiye, one of the primary centers of wheat domestication, harbors a rich landrace diversity adapted to diverse agro-ecological zones. Common bunt (Tilletia foetida) is a seed-borne disease that causes substantial yield and quality losses. In this study, the reactions of 80 local bread wheat genotypes collected from five Turkish provinces to common bunt were evaluated over two cropping seasons (2023–2024 and 2024–2025) under artificial epidemic conditions in Kırşehir and Ankara. Genotype main effects and genotype × environment interactions were analyzed using the GGE-biplot approach. Molecular screening with bunt-resistance-associated markers was performed to detect the presence of the Bt8, Bt9, Bt10, and Bt11 resistance genes. Phenotypic assessments showed that 56% of the genotypes were resistant. The Bt10 gene was identified in 13 genotypes, Bt8 in 9 genotypes, Bt11 in 2 genotypes, and a combined Bt8 + Bt10 gene set in 2 genotypes, whereas Bt9 was not detected in any genotype. The GGE-biplot explained 98.6% of the total variation and highlighted genotypes 67, 68, and 72 as superior under Ankara conditions and genotype 73 under Kırşehir conditions. Phenotypic resistance consistent with the presence of Bt8, Bt10, and Bt11 provides a valuable genetic resource for breeding bunt-resistant wheat lines. Marker-assisted selection, particularly pyramiding Bt8 and Bt10, is recommended to accelerate the development of durable resistance.
The origin of opal-bearing listvenite from the Tokat region (northern Turkey)
(Cambridge University Press, 2026) Başıbüyük, Zeynel; Powolny, Tomasz; Kaydu Akbudak, İlkay; Dumańska-Słowik, Magdalena; Ekincioǧlu, Gökhan
This study reveals the mineralogy and origin of unusual silica-carbonate bodies (listvenite) associated with tectonized serpentinites and Permian-Triassic phyllites from the Tokat region in northern Turkey. The listvenite includes green-coloured opaline silica intersected by saddle dolomite and minor sulfide mineralization (pyrite, cobaltite and enargite). It also hosts abundant chalcedonic bodies, i.e. agate of bluish to bluish-white colour. Listvenite-hosted opaline silica has been recognized as lussatite, a fibrous birefringent opal-CT variety, with a dominantly 'tridymitic' structure. The green colouration results from discrete, but widely disseminated, Cr-bearing smectite-group minerals, such as volkonskoite and/or Cr-montmorillonite. Chromium, the main colouring agent as determined by element-distribution mapping and visible-light spectroscopy, was probably derived from spinel-group minerals (e.g. chromite), the relics of which mark the presence of an ultramafic protolith. In contrast, the vein agate is composed of length-fast chalcedony, with subordinate quartzine and minor opaline silica, followed by drusy quartz. Its bluish colour appears to be related to scattering effects enhanced by elevated moganite contents (up to 46 wt.%). The observed mineral paragenesis suggests at least a two-stage evolution: (1) early listvenitization marked by carbonate-silica alteration of the host serpentinite together with concomitant sulfide precipitation; and (2) subsequent silicification producing chalcedony (agate) veins under low-Temperature conditions, followed by possible dissolution of the earlier saddle dolomite. This evolution reflects complex fluid-rock interactions involving CO2-rich, Ca-bearing and later Si-rich fluids under fluctuating redox and pH conditions. Hence, the proposed crystallization sequence of the associated mineral assemblage is: sulfides (cobaltite+pyrite+enargite) → saddle dolomite → opal (lussatite) + Cr-smectite → chalcedony (agate). These data provide new insights into the genesis, colouration mechanisms and structural state of Cr-bearing opaline and chalcedonic silica in altered ultramafic terrains.
Experimental-numerical study of high-performance fiber-reinforced cementitious composite layer based strengthening of damaged beams
(Techno-Press, 2026) Çağlar, Arzu
Strengthening reinforced concrete (RC) beams using high-performance fiber-reinforced cementitious composite (HPFRCC) layer has emerged as an effective technique for structural retrofitting. This study investigates the flexural behavior of damaged RC beams strengthened with prefabricated HPFRCC layers through a combined experimental and three-dimensional finite element approach. Four-point bending tests were conducted on control and HPFRCC-strengthened beams to validate the numerical model. The validated model was then employed to assess the effects of pre-damage level (0-0.9Fu), HPFRCC layer thickness, and longitudinal reinforcement ratio (0.5-2.0%) on strength, stiffness, ductility, and energy absorption. The results indicate that HPFRCC strengthening can increase the yielding load by up to 36% and the ultimate flexural capacity by up to 25% for beams with moderate pre-damage levels, while improvements reduce to below 10% for severely damaged beams. The numerical results indicate that strengthening damaged reinforced concrete beams with prefabricated HPFRCC composites increased the ultimate flexural load by 28-42%, depending on the composite thickness and strengthening length. The initial flexural stiffness improved by up to 35%, while the mid-span deflection at ultimate load decreased by 18-25% compared to the unstrengthened damaged beams. In addition, the strengthened beams exhibited an increase in the ductility index from 2.1 to 3.4, accompanied by a 30% reduction in tensile damage concentration at the critical cracking zone.
Total diz protez ameliyatı öncesi sesli kitap dinletisinin hastaların kan basıncı, nabız ve kaygı düzeyine etkisi
(Kırşehir Ahi Evran Üniversitesi, Sağlık Bilimleri Enstitüsü, 2026) Yılmaz, Beyza
This study aimed to determine the effect of listening to audiobooks before total knee replacement surgery on patients' blood pressure, pulse rate, and anxiety levels. The study was a randomized controlled experimental study, and the population consisted of patients undergoing total knee replacement surgery at the Orthopedics Clinic of Kırşehir Ahi Evran University Training and Research Hospital. The sample consisted of 93 randomized patients who met the inclusion criteria. Data were collected using the Patient Identification Form, the Patient Blood Pressure and Pulse Rate Findings Form, and the Surgery-Specific Anxiety Scale. The experimental group listened to audiobooks for 20 minutes approximately 40 minutes before surgery. Descriptive statistics, Chi-square analysis, independent samples ttest, and dependent samples t-test were used to evaluate the data. The study found no difference in systolic blood pressure levels between the experimental and control groups after the audiobook application (t=-1.59; p>0.05), however, a significant decrease in diastolic blood pressure was observed in the experimental group (t=-2.01; p<0.05). The study also determined that pulse rates decreased significantly in both the experimental (t=4.74; p<0.001) and control (t=3.38; p<0.01) groups at the final test. The mean scores on the Surgery-Specific Anxiety Scale were significantly lower in the experimental group compared to the control group after the audiobook application (t=-2.77; p<0.01). In conclusion, the audiobook application did not create a significant difference in systolic blood pressure between the groups; however, it significantly reduced diastolic blood pressure and surgery-specific anxiety levels in the experimental group. In addition, a significant decrease in heart rate was observed in both groups, suggesting that listening to audiobooks has positive effects, particularly on diastolic blood pressure and anxiety levels.
Enhancing Mathematical Connection Skills Through Animation-Supported İnstruction: An Experimental Study
(Frontiers Media SA, 2026) Kuzu, Okan; Taşdelen, Zehra
Introduction – The present study aimed to investigate the impact of animation-supported instruction on the development of students' mathematical connection skills. To this end, a conceptual framework was established comprising two main dimensions—internal and external connections—and four sub-dimensions: connections among concepts, among representations, with life contexts, and across disciplines. Methods – A quasi-experimental design with pretest and posttest applications was employed, involving experimental and control groups. The data were collected using a measurement tool developed in accordance with the proposed framework. Results – The results indicated that animation-supported instruction had a significant positive effect on students' mathematical connection skills. The most substantial improvements were observed in the sub-dimensions of connections among concepts and among representations. Students demonstrated an enhanced ability to establish relationships between concepts across different learning domains, relate mathematical knowledge to real-life situations, and integrate mathematics within social and cultural contexts. Discussion – The findings suggest that animation-supported instruction serves as an effective pedagogical approach that strengthens students' mental representations, deepens conceptual understanding, and promotes the transfer and application of mathematical knowledge across various contexts.
