Browsing by Author "Kurt, Erol"

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Citation Count: Kurt, Erol; Hatem,Sude. (2023). "Design and Implementation of a MHz Frequency Transformer with a Ferromagnetic Fluid Core", Sustainability (Switzerland), Vol.15, No.1.
Design and Implementation of a MHz Frequency Transformer with a Ferromagnetic Fluid Core
(2023) Kurt, Erol; Hatem, Sude; 391090
Design and optimization of a magnetic fluid cored transformer are studied for high frequency applications. An easy and cheap fluid core is designed and used to decrease the eddy current and loses, thereby low conducting and paramagnetic features are added. The core exhibits both fluid and solid characteristics exerting high frequency modes in the fluid and low current due to the iron powder inside. The finite element analysis simulations are performed via COMSOL Multi-physics package for different mass fractions of iron powder. The maximum peak-to-peak voltage and power are found as 526 mV and 188.8 mW at 12 MHz from the simulations. 3D patterns prove that the magnetic flux and magnetization exhibit turbulence in the core, thereby localized magnetic values indicate an arbitrary attitude for various frequencies. Optimum mass fraction is found as 0.7, which is parallel with experimental results. The transformer operates between 11 MHz and 13.5 MHz optimally.
Citation Count: Kurt, E., Böyükata, M., Güvenç, Z.B. (2006). Lyapunov exponent as an indicator of phase transition in melting Pd-13 clusters. Physica Scripta, 74(3), 353-361. http://dx.doi.org/10.1088/0031-8949/74/3/009
Lyapunov exponent as an indicator of phase transition in melting Pd-13 clusters
(Royal Swedish Acad Sciences, 2006) Kurt, Erol; Böyükata, Mustafa; Güvenç, Büşra; 13410; 120207
In this study, the chaotic behaviour of Pd13 clusters is investigated in a wide total energy range. To identify interactions between atoms, the embedded atom potential is used in the computer simulation. Various analyses including power spectra, maximal Lyapunov exponents (lambda) and rms bond-length fluctuations (delta) are carried out to identify the characteristics of the system. As a result of these analyses, it is observed that Lyapunov spectra can clearly indicate the co-existence region for Pd-13 clusters and exponents have fixed values above a certain total energy value of the system. In addition, while the fast Fourier transforms give the existence of diffusive motion above the transitional region, the correlation dimension values exhibit a smooth character relevant to the total energies of the system.