WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14720/3

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Comparison and Selection Strategy Among Compensating Topologies in Two-Coil Resonant Wireless Power Transfer Systems
(Academic Publication Council, 2023) Agcal, Ali; Ozkilic, Selin Ozcira; Toraman, Kemalettin
In this study, different compensation topologies for two -coil resonant wireless power transfer systems were compared. Compensation circuits were examined individually according to system parameters such as efficiency, equivalent impedance, frequency, load resistance, and phase angle. System variables were compared to address the constraints on system applicability regarding compensation topology selection in Wireless Power Transfer (WPT) systems. The main motivation of this study is to present a suitable topology selection scheme and flow diagram based on applications with various voltages, currents, powers, and loads. Simulations carried out using Simulink for the four main topologies under various load conditions indicated that choosing the proper compensation topology for an appropriate load is essential. The simulation results were validated using both Matlab and C # calculation codes. Analyses according to frequency under various load conditions show that efficiency variations depend on the compensation topology of the receiver side. Furthermore, this study revealed that the topology of the transmitter side only affects the equivalent impedance and amount of power drawn from the input; hence, it has no effect on the efficiency and load characteristics. Consequently, for low -load resistance, such as electric vehicle or mobile phone charging, topologies with series compensation on the receiver side are preferred. Correlatively, topologies with parallel compensation on the receiver side can be evaluated as suitable for high -load resistance, low -current, and low -power operations, such as biomedical appliance charging.
Microstrip Filters Based on Open Stubs and Sir for High Frequency and Ultra-Wideband Applications
(Academic Publication Council, 2022) TahaImeci, S.; Tutuncu, Bilal; Beslija, Faruk; Herceg, Lamija
This paper includes two new microstrip filter configurations for high frequency and ultra-wideband applications. The first proposed filter is a composition of four parallel open-circuited stubs connected by optimized fractal-structured microstrip line. The filter response is a combination of three passing regions, namely, low pass from 0.1 GHz to 3 GHz, band-pass from 4.5 GHz to 9 GHz, and high pass from 10.5 GHz to 13 GHz, separated by two rejection regions from 3 GHz to 4.5 GHz and 9 GHz to 10.5 GHz. Deep and sharp rejection regions reaching up to-44.6 dB with 40 % fractional bandwidth (FBW) are observed with a good electrical performance. Furthermore, with a comparative table, the advantages of this proposed BSF in terms of FBW, compactness, and insertion loss are compared with recently reported related studies. Secondly, a dual -band band-pass filter implementing a stepped-impedance resonator (SIR) and a modified H-shaped structure is presented. This filter is designed to operate in a low pass region up to 3.58 GHz and a band-pass region from 15.38 to 21.65 GHz, with a wide stopband region between 4.46 and 14.07 GHz. The simulated and measured results are in good agreement. Compared to its peers, the compact size and low price allow for a wide application of these filter configurations, while passing frequencies allow operation in the unlicensed frequency spectrum, which is popular for high-speed communication.
A New Result on the Boundedness of Solutions To a Nonlinear Differential Equation of Fifth-Order With Delay
(Academic Publication Council, 2009) Tunc, Cemil
In this paper, some sufficient conditions are established to guarantee the boundedness of all solutions of a specific nonlinear differential equation of fifth order with constant delay. By introducing a Lyapunov functional, we obtain a new result on the boundedness of solutions of a delay differential equation of fifth order.
A Novel Computational Method for Solving Nonlinear Volterra Integro-Differential Equation
(Academic Publication Council, 2021) Cakir, Musa; Gunes, Baransel; Duru, Hakki
In this paper, we study quasilinear Volterra integro-differential equations (VIDEs). Asymptotic estimates are made for the solution of VIDE. Finite difference scheme, which is accomplished by the method of integral identities using interpolating quadrature rules with weight functions and remainder term in integral form, is presented for the VIDE. Error estimates are carried out according to the discrete maximum norm. It is given an effective quasilinearization technique for solving nonlinear VIDE. The theoretical results are performed on numerical examples.
Reliability Estimation and Parameter Estimation for Inverse Weibull Distribution Under Different Loss Functions
(Academic Publication Council, 2022) Yilmaz, Asuman; Kara, Mahmut
In this paper, the classical and Bayesian estimators of the unknown parameters and the reliability function of the inverse Weibull distribution are considered. The maximum likelihood estimators (MLEs) and modified maximum likelihood estimators (MMLEs) are used in the classical parameter estimation. Bayesian estimators of the parameters are obtained by using symmetric and asymmetric loss functions under informative and non-informative priors. Bayesian computations are derived by using Lindley approximation and Markov chain Monte Carlo (MCMC) methods. The asymptotic confidence intervals are constructed based on the maximum likelihood estimators. The Bayesian credible intervals of the parameters are obtained by using the MCMC method. Furthermore, the performances of these estimation methods are compared concerning their biases and mean square errors through a simulation study. It is seen that the Bayes estimators perform better than the classical estimators. Finally, two real-life examples are given for illustrative purposes.
Uniform Ultimate Boundedness of the Solutions of Third-Order Nonlinear Differential Equations
(Academic Publication Council, 2005) Tunc, C
We obtain some sufficient conditions which ensure that all solutions of son-le nonlinear third-order differential equations are uniformly ultimately bounded.

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