Ahi Evran University

About: Ahi Evran University is a education organization based out in Kırşehir, Turkey. It is known for research contribution in the topics: Density functional theory & Ab initio. The organization has 842 authors who have published 2270 publications receiving 21904 citations.

Çevrimiçi Öğrenme Hazır Bulunuşluluk Ölçeği: Geçerlik ve Güvenirlik Çalışması

Abstract: Öz Bu araştırmanın amacı, Çevrimiçi Öğrenme Hazır Bulunuşluluk Ölçeği’nin (Hung, Chou, Chen ve Own, 2010) Türkçe formunu elde etmek ve ölçek maddeleri ile ölçek genelinin psikometrik özelliklerini incelemektir. Araştırma iki bölümde ele alınmıştır; a) ölçeğin Türkçe versiyonunun elde edilme süreci 13 alan ve dil uzmanı ile b) uygulama süreci ise 5 farklı üniversiteden 724 öğrenci ile yürütülmüştür. Ölçeğin Türkçe formunun kâğıt-kalem uygulamasından elde edilen verilerin faktör çözümlemesi sonucu 18 maddenin beş farklı alt boyuta ilişkin bağıntıları anlamlı sonuçlar vermiştir. Bununla birlikte alt boyutlar arası korelasyonlar ve ortalama açıklanan varyans değerleri üzerine yapı geçerliği (yakınsama ve ayırt edici geçerlik) çalışması olumlu sonuçlar vermiştir. Bu sonuçlar Çevrimiçi Öğrenmeler İçin Öğrenenlerin Hazır Bulunuşluluk Ölçeği’nin Türkçe formunun geçerli ve güvenilir bir ölçme aracı olduğunu göstermektedir. Anahtar Sözcükler: Çevrimiçi öğrenenler için hazır bulunuşluluk, ölçek, geçerlik, güvenirlik. Abstract The purpose of this study is to develop the Turkish version of Online Learning Readiness Scale -OLRS(Hung, Chou, Chen, & Own, 2010) and to investigate the psychometric properties, such as the validity and reliability, of this scale. The study was conducted in two stages: a) the development of the Turkish version of the scale with judgments of 13 experts of language and study domain, and b) the implementation of the scale with a total of 724 students from 5 different universities. The Turkish form of the scale was administered to participants to obtain the application data set. Confirmatory factor analysis based on the relations of 18 items on 5 different sub dimensions, reported by Hung et al., (2010) was applied on the data set. The factor loadings obtained from factor analysis were statistically significant and numerically satisfactory. In addition to this, the results of construct validity (convergent validity and discriminant validity) based on correlation among sub-dimensions, and on average variance extraction were satisfactory. These results showed that the Turkish version of the OLRS was a valid and reliable measurement tool.

Nanospheres caped Pt(II) and Pt (IV): synthesis and evaluation as antimicrobial and Antifungal Agent

Abstract: Abstract Antimicrobial and antifungal polymers are gaining the attention of pharmaceutical makers and industrial design. Nanospheres-Polymers attached Platinum(II) / (IV) complexes have been synthesized to investigate antimicrobial activities. Firstly, nanospheres involving Schiff bases were synthesized from (aminomethyl) polystyrene and four substitute salicylaldehyde (2-hydroxy benzaldehyde, 5-fluoro-2-hydroxy benzaldehyde, 5-kloro-2-hydroxy benzaldehyde, 5-bromo-2-hydroxy benzaldehyde). Secondly, polymers attached Platinum(II) / (IV) complexes have been prepared by means of template method. The IR spectra show that the ligands act in a monovalent bidentate fashion all nanospheres involving Schiff bases. Square-planar and octahedral structures are proposed for Pt(II) and Pt(IV), respectively. All these substances have been examined for antibacterial activity against pathogenic strains, and antifungal activity. In particular, Pt(IV) complexes were more potent bactericides than all of the synthesized substances.

Effect of Mg content on electronic structure, optical and structural properties of amorphous ZnO nanoparticles: A DFTB study

Abstract: In this work, we perform a theoretical analysis of structural, electronic, and optical properties of pure and Mg-doped amorphous ZnO nanoparticles (a-ZnO NPs) using DFTB method. Our results show that Zn atoms are more preferential for Mg atoms than for O atoms because the number of Mg Zn bonds is greater than that of Mg O. The rise in the content of Mg in a-ZnO NPs leads to an increase of Mg–Zn and Mg O interactions. Mg atoms prefer to locate near the center of a-ZnO NP, but Zn and O atoms nearly preserve their positions which is compatible with radial distribution function peaks. The orbital energies display a decrease in the energy gap from 3.592 to 3.546 eV while increasing Mg content. The LUMO level is also significantly shifted to higher energies. The results also reveal that the performance of pure a-ZnO NP can be enhanced with a subsequent increase in Mg content.

Determination of current transport characteristics in Au-Cu/CuO/n-Si Schottky diodes

Abstract: In this study, the material properties of CuO thin films fabricated by sputtering technique and electrical properties of CuO/n-Si structure were reported. Temperature-dependent current-voltage (I-V) measurement was carried out to determine the detail electrical characteristics of this structure. The anomaly in thermionic emission (TE) model related to barrier height inhomogeneity at the interface was obtained from the forward bias I-V analysis. The current transport mechanism at the junction was determined under the assumption of TE with Gaussian distribution of barrier height. In this analysis, standard deviation and mean zero bias barrier height were evaluated as 0.176 and 1.48 eV, respectively. Depending on the change in the diode parameters with temperature, Richardson constant was recalculated as 110.20 Acm−2K−2 with the help of modified Richardson plot. In addition, density of states at the interface were determined by using the forward bias I-V results.

Polystyrene Containing Carbinolamine/Azomethine Potentially Useful as Antimicrobial Agent: Synthesis and Biological Evaluation

Abstract: An investigation of antimicrobial properties of 12 novel modified polymer derived from the condensation reaction of (aminomethyl)polystyrene and four substitute salicylaldehyde (2-hydroxy benzaldehyde, 5-fluoro-2 hydroxy benzaldehyde, 5-fluoro-3-chloro-salicylaldehyde and 5-fluoro-3-methyl-salicylaldehyde) has been carried out and Cr(III) and Ni(II) complexes have been prepared. Modified polymers were characterized by magnetic susceptibility, elemental analyses, and spectral studies. The 1H NMR and 13C NMR spectra analysis of the polymeric carbinolamine/azomethine were determined. In addition, surface morphology and composition were determined by SEM/EDX. Thermo gravimetric analyses of polymers were carried out in nitrogen atmosphere. Antibacterial activities of the polymers attached carbinolamine/azomethine and their complexes were studied by the well-diffusion method against Listeria monocytogenes 4b, Staphylococcus aureus, Escherichia coli, Salmonella typhi H, Brucella abortus, Staphylococcus epidermis sp., Micrococcus luteus, Shigella dysenteria type 10, Bacillus cereus, Pseudomonas putida and antifungal activity against Candida albicans.