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| 1 | An Investigation of Ionic Flows in a Sphere-Plate Electrode Gap显示文摘This paper presents analyses of ion flow characteristics and ion discharge pulses in a sphere-ground plate electrode system.As a result of variation in electric field intensity in the electrode gap,the ion flows towards electrodes generate non-uniform discharging pulses.Inspection of these pulses provides useful information on ionic stream kinetics,the effective thickness of ion cover around electrodes,and the timing of ion clouds discharge pulse sequences.A finite difference time domain(FDTD)based space-charge motion simulation is used for the numerical analysis of the spatio-temporal development of ionic flows following the first Townsend avalanche,and the simulation results demonstrate expansion of the positive ion flow and compression of the negative ion flow,which results in non-uniform discharge pulse characteristics. | H.Z.ALISOY S.ALAGOZ G.T.ALISOY B.B.ALAGOZ | 2013 | Plasma Science and Technology2013，15，10： | 0 |
| 2 | Modeling and analysis of dielectric materials by using gradient-descent optimization method显示文摘This study presents a numerical method based on parallel RC equivalent circuit model fitting methodology for analysis and modeling of dielectric materials.The proposed method employs gradient-descent optimization method(GDOM)to estimate parallel RC equivalent circuit model from current waveforms by minimizing sum of squared difference(SSD)error.Estimation of parallel RC equivalent circuit parameters from measured current waveforms provides a useful tool for identification,simulation and analysis of dielectric materials.Moreover,applications of the proposed method for time and frequency analyses of dielectric materials are demonstrated numerically.Numerical simulations were presented to discuss efficiency of the proposed method for modeling,analysis and monitoring of insulator materials. | B.B.Alagoz H.Z.Alisoy M.Koseoglu S.Alagoz | 2017 | International Journal of Modeling, Simulation, and Scientific Computing2017，8，1： | 0 |
| 3 | Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses显示文摘In this study,wave propagation anisotropy in a triangular lattice crystal structure and its associated waveform shaping in a crystal structure are investigated theoretically.A directional variation in wave velocity inside a crystal structure is shown to cause bending wave envelcpes.The authors report that a triangular lattice sonic crystal possesses six numbers of a high symmetry direction,which leads to a wave convergence caused by wave velocity anisotropy inside the crystal.However,two of them are utilized mostly in wave focusing by an acoustic flat lens.Based on wave velocity anisotropy,the pseudo ideal imaging effect obtained in the second band of the flat lens is discussed. | S.Alagoz | 2012 | Chinese Physics B2012，21，12： | 0 |
| 4 | Negative refractions by triangular lattice sonic crystals in partial band gaps显示文摘This study numerically demonstrates the effects of partial band gaps on the negative refraction properties of sonic crystal. The partial band gap appearing at the second band edge leads to the efficient transmissions of scattered wave envelopes in the transverse directions inside triangular lattice sonic crystal, and therefore enhances the refraction property of sonic crystal. Numerical simulation results indicate a diagonal guidance of coupled scattered wave envelopes inside crystal structure at the partial band gap frequencies and then output waves are restored in the vicinity of the output interface of sonic crystal by combining phase coherent scattered waves according to Huygens' principles. This mechanism leads to two operations for wavefront engineering: one is spatial wavefront shifting operation and the other is convex–concave wavefront inversion operation. The effects of this mechanism on the negative refraction and wave focalization are investigated by using the finite difference time domain(FDTD) simulations. This study contributes to a better understanding of negative refraction and wave focusing mechanisms at the band edge frequencies, and shows the applications of the slab corner beam splitting and SC-air multilayer acoustic system. | S.Alagoz B.B.Alagoz A.Sahin S.Nur | 2015 | Chinese Physics B2015，24，4： | 0 |
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