Browsing by Subject "Plasmas"

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    Experimental observation of true left-handed metamaterial
    (IEEE, 2005) Aydın, Koray; Güven, Kaan; Özbay, Ekmel
    We report a true left-handed (LH) behavior in composite metamaterials. The magnetic resonance of the SRR structure is demonstrated. Plasma frequency of the LH material is shown to be lower than that of the wires.
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    Mathematical and numerical modeling of the effect of input-parameters on the flushing efficiency of plasma channel in EDM process
    (Elsevier Ltd, 2013) Shabgard, M.; Ahmadi, R.; Seyedzavvar, M.; Oliaei, S.N.B.
    In the present study, the temperature distribution on the surface of workpiece and tool during a single discharge in the electrical discharge machining process has been simulated using ABAQUS code finite element software. The temperature dependency of material properties and the expanding of plasma channel radius with time have been employed in the simulation stage. The profile of temperature distribution has been utilized to calculate the dimensions of discharge crater. Based on the results of FEM and the experimental observations, a numerical analysis has been developed assessing the contribution of input-parameters on the efficiency of plasma channel in removing the molten material from molten puddles on the surfaces of workpiece and tool at the end of each discharge. The results show that the increase in the pulse current and pulse on-time have converse effects on the plasma flushing efficiency, as it increases by the prior one and decreases by the latter one. Later, the introduced formulas for plasma flushing efficiency based on regression model were utilized to predict the cardinal parameter of recast layer thickness on the electrodes which demands expensive empirical tests to be obtained. © 2012 Elsevier Ltd. All rights reserved.
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    Plasma modes in layered superconductors
    (Elsevier B.V., 2005) Askerzade, I. N.; Tanatar, Bilal
    An expression for the plasmon spectrum in the layered superconductors with arbitrary thickness of planes, which varies within a wide range is obtained. The obtained result can be attractive for the explanation of experimental data on plasmon modes in cuprates and other recently discovered superconductors.