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
Molecular identification of Trichogramma Westwood, 1833 species as egg parasitoids of Ostrinia nubilalis (Hübner, 1796) in corn production areas of Sakarya province in Türkiye (Insecta: Lepidoptera, Hymenoptera)
(Soc Hispano-Luso-Amer Lepidopterologia-Shilap, 2025) Ercan, Fahriye Sümer; Öztemiz, Sevcan
The study focuses on using ITS2 sequences from rDNA for systematic studies of Trichogramma Westwood, 1833 species. ITS2 sequences have shown to be reliable in distinguishing Trichogramma species. Accurate identification of natural enemies is essential for biological control programs. The aim of the study is to compare rDNA-ITS2 sequences from Trichogramma samples with sequences in GenBank. By utilizing ITS2 as a barcode, the study aims to achieve dependable species identification and evaluate genetic diversity within Trichogramma species. ITS2 sequence was used to differentiate two Trichogramma species, Trichogramma euproctidis (Girault, 1911) and Trichogramma brassicae Bezdenko, 1968 collected from Sakarya province of Türkiye. The ITS2 sequences of the two Trichogramma species were aligned using Clustal W, and genetic distances as well as a phylogenetic tree were calculated using MEGA V7.0. In the study, rDNA-ITS2 sequences of fifty four Trichogramma specimens were confirmed in GenBank. Additionally Mfold web server was used to predict secondary structures of ITS2 sequences. The construction of all secondary structures was carried out at 37ºC using RNA version 2.3 default parameters. The study identified a new species that expands the Trichogramma fauna of Sakarya Province in northwestern Türkiye, where only one species had previously been detected through rDNA-ITS2 sequence analysis. This shows the importance of molecular markers in species identification and biological control strategies.
Effect of Some Non-Genetıc Factors on Change of Sex Ratıo in the Awassı Sheep Breed
(Pakistan Agricultural Scientists Forum, 2025) Yılmaz, I.; Sarı, Mehmet; Önk, K.; Kaygısız, A.
This study investigated the influence of environmental and maternal factors on the sex ratio of Awassi lambs reared at the Ceylanpinar State Production Farm (CSPF) in Türkiye. Lambing data from 2004 to 2011 were analyzed using factorial ANOVA (FANOVA) and chi-square tests to evaluate the effects of lambing year and ewe age. While the effect of lambing year on sex ratio was only marginally significant (p<0.10), a statistically significant relationship was found between lamb sex and lambing year (p<0.01), indicating temporal variation in sex ratio. In particular, a female sex ratio of 54.41%, 55.58% and 52.21% was observed in the drought years 2006, 2007 and 2008, respectively. These patterns suggest that environmental stressors such as drought and reduced forage availability may exert directional pressure in favor of female offspring under suboptimal conditions. The results are consistent with the Trivers-Willard hypothesis and support the notion that maternal condition may influence sex allocation in a context-dependent manner.
Optimization-Based Exergoeconomic Assessment of an Ammonia–Water Geothermal Power System with an Elevated Heat Source Temperature
(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Tiktaş, Aslı
Geothermal energy has been recognized as a promising renewable resource for sustainable power generation; however, the efficiency of conventional geothermal power plants has remained relatively low, and high investment costs have limited their competitiveness with other renewable technologies. In this context, the present study introduced an innovative geothermal electricity generation system aimed at enhancing energy efficiency, cost-effectiveness, and sustainability. Unlike traditional configurations, the system raised the geothermal source temperature passively by employing advanced heat transfer mechanisms, eliminating the need for additional energy input. Comprehensive energy, exergy, and exergoeconomic analyses were carried out, revealing a net power output of 43,210 kW and an energy efficiency of 30.03%, notably surpassing the conventional Kalina cycle’s typical 10.30–19.48% range. The system’s annual electricity generation was 11,138.53 MWh, with an initial investment of USD 3.04 million and a short payback period of 3.20 years. A comparative assessment confirmed its superior thermoeconomic performance. In addition to its technoeconomic advantages, the environmental performance of the proposed configuration was quantified. A streamlined life cycle assessment (LCA) was performed with a functional unit of 1 MWh of net electricity. The proposed system exhibited a carbon footprint of 20–60 kg CO2 eq MWh−1 (baseline: 45 kg CO2 eq MWh−1), corresponding to annual emissions of 0.22–0.67 kt CO2 eq for the simulated output of 11,138.53 MWh. Compared with coal- and gas-fired plants of the same capacity, avoided emissions of approximately 8.6 kt and 5.0 kt CO2 eq per year were achieved. The water footprint was determined as ≈0.10 m3 MWh−1 (≈1114 m3 yr−1), which was substantially lower than the values reported for fossil technologies. These findings confirmed that the proposed system offered a sustainable alternative to conventional geothermal and fossil-based electricity generation. Multi-objective optimization using NSGA-II was carried out to maximize energy and exergy efficiencies while minimizing total cost. Key parameters such as turbine inlet temperature (459–460 K) and ammonia concentration were tuned for performance stability. A sensitivity analysis identified the heat exchanger, the first condenser (Condenser 1), and two separators (Separator 1, Separator 2) as influential on both performance and cost. The exergoeconomic results indicated Separator 1, Separator 2, and the turbine as primary locations of exergy destruction. With an LCOE of 0.026 USD/kWh, the system emerged as a cost-effective and scalable solution for sustainable geothermal power production without auxiliary energy demand.
AI-Driven Discovery of High-Performance Limhx (M = Sc, Ti; X = 3, 4, 5) Hydrides: A First-Principles İnvestigation Structural, Mechanical, Electronic, Thermophysical, Optical and Hydrogen Storage Properties
(Elsevier Ltd, 2025) Yamçıçıer, Çağatay; Yamçıçıer, Sümeyra; Kürkçü, Cihan
[Not Abstract Available]
Biochemical and Mineral Profiling of ‘Karaevrek’ Grape from the Perspective of Sustainability and Waste Management
(Springer Science and Business Media Deutschland GmbH, 2025) Ergün, Fatma; Bayam, Hikmet
Recent increases in population density, environmental pollution, and global warming necessitate more efficient use of food resources. Research into the utilisation and economic recovery of waste materials from food processing has gained momentum. This study investigates the health benefits of the ‘Karaevrek’ grape variety, cultivated in the Kayseri/Incesu region, by examining its antioxidant capacity, phenolic and flavonoid content, and mineral and bioactive compound profiles in the fruit flesh, grapeseeds, leaves, and pedicels. Notably, grapeseeds exhibited the highest total phenolic content (176.11 ± 3.15 mg gallic acid equivalents/g) and strongest antioxidant activity (95.20 ± 0.21% radical scavenging; 352.00 μg trolox equivalents/mL Copper (II) Reducing Capacity), alongside the highest concentrations of all analysed minerals, particularly potassium (296.81 ppm), magnesium (122.22 ppm), and iron (8.96 ppm). Leaves (KL) displayed the highest flavonoid content (301.98 ± 6.44 mg quercetin equivalents/g), indicating complementary bioactive potential. Phosphorus was most abundant in the stem (2.73 ppm), while magnesium was prominent in fruit flesh (13.36 ppm). Gas Chromatography/Mass Spectrometry (GC-MS) analyses identified 54 compounds, including antioxidant hexadecanoic acid methyl ester and cardioprotective Vitamin E. The findings suggest that ‘Karaevrek’ grapes, particularly their grapeseeds, leaves, and pedicels, could be valuable natural additives in the food industry, emphasising the need for further studies on local varieties’ biochemical properties.
