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
Investigation of Structural, Electronic, Elastic, Vibrational, Thermodynamic, and Optical Properties of Mg2NiH4 And Mg2RuH4 Compounds used in Hydrogen Storage
(Elsevier, 2024) Yamçiçier, Çağatay; Kürkçü, Cihan
Structural, electronic, elastic, vibrational, thermodynamic, and optical properties of Mg2XH4 (X = Ni, Ru) compounds were investigated using density functional theory in the presence of zero temperature and pressure. Under ambient conditions, the Mg2NiH4 crystallizes in an orthorhombic type structure with space group Pccn and there are 56 atoms in its unit cell. Mg2RuH4 crystallizes in an orthorhombic type structure with space group Cmcm and contains 28 atoms in its unit cell. In addition, electronic band structure calculations were made for the orthorhombic structures of these two compounds. Mg2NiH4 is a direct band gap semiconductor of 1.3479 eV, while Mg2RuH4 is a semiconductor with an indirect band gap of 0.8768 eV. To understand whether the studied structures of Mg2XH4 are dynamically stable, phonon calculation was performed and both structures were found to be stable. In addition, the second-order independent elastic constant values, which give information about the hardness of Mg2XH4 and whether it is mechanically stable or not, were also calculated. From the elastic constant results obtained, Mg2XH4 was found to be mechanically stable in both structures. Some stiffness constants such as Bulk modulus (B), Shear modulus (G), Young's Modulus (E), and Poisson's ratio (upsilon) were also calculated from elastic constant values. According to the B/G ratio, the material was found to be brittle in both structures. It was also observed that the atoms forming the structures according to the Poisson ratio were connected by ionic bonds. In addition, thermo-physical and optical calculations of the compounds were also examined to have more information about the physical properties of Mg2XH4.
On absolute matrix summability factors of infinite series and Fourier series
(ELSEVIER, 2021) Yıldız, Şebnem
Quite recently, Bor (2021) [22] has proved two main theorems dealing with absolute Riesz summability factors of infinite series and Fourier series by using an almost increasing sequence. In this paper, we have generalized these theorems to the |A,pn|k summability method.
Efficacy of Poller Screw in Addition to Lag Screw in the Treatment of Intertrochanteric Fractures with Proximal Femoral Nail: A Biomechanical Evaluation
(Sprınger Heıdelberg, 2024) Horoz, Levent; Çakmak, Mehmet Fevzi; Cici, Hakan
Purpose The most common type of failure in treating intertrochanteric fractures with proximal femoral nails is cut-out due to varus collapse. We aim to evaluate the effect of the poller screw applied to the proximal fragment and the lag screw on varus collapse and stability in intertrochanteric fractures. Methods An unstable intertrochanteric fracture model without medial support was simulated in 20 synthetic femur models. In the poller screw group, in addition to the lag screw, pole screws were applied to the proximal fragment superior and inferior to the lag screw. In the progressive cyclic loading test, starting from 100 N, the loading was increased by 50 N in each cycle, and the test was continued until the maximum load at which failure occurred as a result of conditioning cycles and progressive cyclic loading tests, stiffness, type of failure, force at failure, lag screw displacement, and varus collapse were recorded. Result The average stiffness was found to be 124.705 N/mm in the poller screw group and 102.77 N/mm in the control group (P < 0.001). The maximum load to failure was 1897.10 N in the poller screw group and 1475.20 N in the control group (P < 0.001). The average displacement of the lag screw within the femoral head was 0.85 mm in the poller screw group and 3.60 mm in the control group (P < 0.001). Conclusion As a result, it has been shown that poller screws applied around the lag screw increase fixation stiffness and reduce varus collapse.
Stable Elastic Nail Application with Poller K-Wire for Irreducible Distal Radius Metaphyseal-Diaphyseal Junction Fractures in Preadolescents: A New Operative Technique
(BMC, 2024) Horoz, Levent; Çakmak, Mehmet Fevzi; Kırçıl, Cihan
Background Surgical treatment of irreducible distal radius diaphyseal- metaphyseal junction fractures involves difficulties as the fracture remains too proximal for K-wire fixation and too distal for the elastic stable intramedullary nail. Our study aims to present the clinical results of applying an elastic stable intramedullary nail with a poller K-wire to achieve both reduction and stable fixation. Patients and methods A retrospective analysis was performed on 26 patients who underwent ESIN with a poller K-wire for distal radius diaphyseal-metaphyseal region fracture. Reduction parameters such as residual angulation and alignment were evaluated on postoperative follow-up radiographs. Changes in angular and alignment parameters on follow-up radiographs were recorded. Wrist and forearm functions were evaluated at the last follow-up. Result There were 17 male and nine female patients with an average age of 10.9. The residual angulation in coronal and sagittal planes on immediate postoperative radiographs was 4.0 +/- 1.62(degrees); and 3.0 +/- 1.26(degrees);, respectively. The mean translation rate on immediate postoperative radiographs was 6.0 +/- 1.98% and 5.0 +/- 2.02% in the coronal and sagittal planes, respectively. No change was observed in translation rates in the last follow-ups. The mean angulation in the coronal and sagittal planes measured on 6th-week radiographs was 4.0 +/- 1.72(degrees) 3.0 +/- 1.16(degrees,) respectively. No significant difference was observed in angular changes in the sagittal and coronal planes at the last follow-up (p > 0.05). No tendon injury or neurovascular injury was observed in any of the patients. Conclusion In the surgical treatment of pediatric DRDMJ fractures, applying ESIN with poller K-wire is an effective, safe, and novel method for achieving reduction and stable fixation.
Sprint and Anaerobic Power with the Soccer-Specific ACTN3 Gene: A Distintive Example
(Universidad de la Frontera, 2024) Söyler, Mehmet; Zileli, Raif; Özkamçı, Hüseyin; Diker, Gürkan; Sever, Mehmet Onur; Ön, Sadi; Yılmaz, Özlem Özge
The aim of this study is twofold: (1) to identify differences in certain anaerobic parameters (10m sprint, 30m sprint, anaerobic power, and Illinois agility tests) between professional and amateur soccer players, and (2) to determine whether there is a difference in the ACTN3 gene polymorphism between professional and amateur soccer players. Ultimately, the goal is to reveal which parameters contribute to the differentiation in these two aspects. A total of 133 volunteer soccer players, including 71 professionals and 62 amateurs, participated in the research. DNA extraction from buccal epithelial cells was performed using a commercial kit to determine the genetic background of the athletes, and Real-Time PCR was conducted for genotyping. Statistical analysis of the findings obtained from the test results was performed using the SPSS 23 (SPSS Inc., Chicago, IL, USA) package program. The homogeneity of variance of the data was assessed using the Levene Test, and normal distribution analyses were conducted using the Shapiro-Wilk Test. Chi-square and Mann-Whitney U tests were employed for parameter analysis. The significance level was set at p<0.05. Evaluation of the data in our study revealed no statistically significant difference in ACTN3 rs1815739 gene polymorphism between the groups (p>0.05). However, there is a statistically significant difference in anaerobic parameters (10m sprint, 30m sprint, and anaerobic power) except for the Illinois test (p<0.05). In conclusion, our study found that gene polymorphism is not a differentiating factor between professional and amateur soccer players, but speed (10m and 30m) and anaerobic power parameters are differentiating factors. © 2024, Universidad de la Frontera. All rights reserved.
