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Landau damping in a bounded magnetized plasma column

Chinese Physics B 2015年第2期24卷 287-294页

作者： h.zakeri-Khatir F.m.Aghamir Department of Physics University of Tehran

The damping decrement of Landau damping and the effect of thermal velocity on the frequency spectrum of a propagating wave in a bounded plasma column are *** magnetized plasma column partially filling a cylindrical metallic tube is considered to be collisionless and *** Landau damping is due to the thermal motion of charge carriers and appears whenever the phase velocity of the plasma waves exceeds the thermal velocity of *** analysis is based on a self-consistent kinetic theory and the solutions of the wave equation in a cylindrical plasma waveguide are presented using Vlasov and maxwell *** hybrid mode dispersion equation for the cylindrical plasma waveguide is obtained through the application of appropriate boundary conditions to the plasma-vacuum *** dependence of Landau damping on plasma parameters and the effects of the metallic tube boundary on the dispersion characteristics of plasma and waveguide modes are investigated in detail through numerical calculations.

关键词： Landau damping cylindrical plasma waveguide Vlasov equation dispersion characteristic

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Analysis of Landau damping in radially inhomogeneous plasma column

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Chinese Physics B 2018年第5期27卷 365-373页

作者： h Rajabalinia-Jelodar m K Salem F m Aghamir h zakeri-Khatir Plasma Physics Research Center Science and Research BranchIslamic Azad University Department of Physics University of Tehran

The Landau damping behavior in a cylindrical inhomogeneous warm magnetized plasma waveguide has been *** radial inhomogeneity for different characteristic lengths（L0） with strong spatial dispersion has been taken into *** analyses have been considered for two limits ωce 〈 ωpe and ωce 〉 ωpe. Due to the radial inhomogeneity of the plasma, all essential equations for studying the Landau damping are calculated in the Bessel–Furrier and differential Bessel–Furrier expansions. The dependence of Landau damping on the inhomogeneity, temperature and external magnetic field for electrostatic modes is scrutinized and described in detail through numerical calculations. The associated numerical results are presented and discussed.

关键词： inhomogeneous warm plasma cylindrical plasma waveguide Landau damping electrostatic modes

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Events and reaction mechanisms during the synthesis of an AI2O3-TiB2 nanocomposite via high energy ball milling

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 123-129页

作者： m. ABDELLAhI m. zakeri h. BAhmANPOUR materials Engineering Department Islamic Azad University Saveh Branch Saveh Iran Ceramic Department Materials and Energy Research Center Tehran 31787/316 Iran Chemical engineering and materials Science Department University of California Davis CA 95616 USA

An AI2O3-TiB2 nanocomposite was success- fully synthesized by the high energy ball milling of A1, B2O3 and TiO2. The structures of the powdered particles formed at different milling times were evaluated by X-ray diffraction （XRD）, scanning electron microscopy （SEm） and transmission electron microscopy （TEm）. Thermo- dynamic calculations showed that the composite formed in two steps via highly exothermic mechanically induced self-sustaining reactions （mSRs）. The composite started to form at milling times of 9-10 h but the reaction was not complete. The remaining starting materials were consumed by increasing the milling time to 15 h. The XRD patterns of the annealed powders showed that aluminum borate is one of the intermediate products and that it is consumed at higher temperatures. heat treatment of the 6-h milled sample at l l00℃ led to a complete formation of the composite. Increasing the milling time to 15 h led to a refining of the crystallite sizes. A nanocomposite powder with a mean crystallite size of 35-40 nm was obtained after milling for 15 h.

关键词： ball milling nanocomposite AI2O3 TiB2

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high-frequency induction heated sintering of ball milled Fe-WC nanocomposites

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International Journal of minerals,metallurgy and materials 2013年第7期20卷 693-699页

作者： m. zakeri T. Zanganeh A. Najafi Ceramic Department Materials and Energy Research Center P.O. Box 31787/316 Karaj Iran Department of materials Saveh Branch Islamic Azad University Saveh Iran

Fe-WC nanocomposites were successfully fabricated by high-frequency induction heated sintering of ball milled nanostructure powders. The ball milled powders were characterized by X-ray diffraction. Density measurements by the Archimedes method show that all sintered samples have the relative density higher than 95%. Studies on the effects of WC content, milling speed, and milling time indicate that a higher milling speed and a more WC content lead to the improvement of mechanical properties. There is a very good distribution of WC particles in the Fe matrix at the milling speed of 650 r/rain. For the sintered sample 20-5-650 （20wt% WC, milling time of 5 h, and milled speed of 650 r/min）, the maximum Brinell hardness and yield stress are obtained to be 3.25 GPa and 858 mPa, respectively. All sintered samples have brittle fracture during compression test except the sample 20-5-650.

关键词： nanocomposites metallic matrix composites iron tungsten carbide induction heating sintering mechanicalproperties

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