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- 저자 : M. Senel (검색결과 2 건)
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B. Unal,M. Senel,A. Baykal,H. Sözeri 한국물리학회 2013 Current Applied Physics Vol.13 No.7
Functionalized multiwall carbon nanotubes (MWCNT-COOH) were decorated with crystalline cobalt ferrite nanoparticles (CoFe2O4 NPs) by co-precipitation reaction to form MWCNT-COOH/CoFe2O4 hybrid. The hybrid was characterized by X-ray diffraction analysis, transmission electron microscopy (TEM),Fourier transfom infrared spectroscopy and vibrating sample magnetometry. The results confirmed that MWCNTs and CoFe2O4 NPs coexisted in the hybrid. The TEM results showed a thick layer of CoFe2O4 was intimately connected to the surface of MWCNTs. The saturation magnetization value of the hybrid was 11.5 emu/g. There has been a high frequency fluctuation in conductivity, however, above all dc conductivity changes and resulting activation energy is calculated from the Arrhenius plots. It is found to vary with the temperature regions. This can be attributed to the existence of a conventional temperature independent tunneling conduction mechanism, which can be also explained that the metallic conduction is a dominant mechanism around room temperature. The ac conductivity of MWCNT-COOH/CoFe2O4hybrid might also be a consequence of the predictions of the universal dynamic response and the ‘n’power exponents could be determined with lower concentration of the addition in the hybrids.
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Continuities and separation axioms in interval-valued topological spaces
Jeong Gon Lee,G. Senel,S. M. Mostafa,Kul Hur 원광대학교 기초자연과학연구소 2023 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.25 No.1
In this paper, we define an interval-valued continuity and study its several properties. Next, we define separation axioms T$_{0}$, T$_{1}$, T$_{2}$, T$_{3}$, T$_{4}$ of some types in an interval-valued topological space, discuss some relationships among them and give various examples. Finally, we introduce the concept of interval-valued fuzzy subspaces and obtain some of its properties.
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