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Mode filtering based on ponderomotive force nonlinearity in a plasma filled rectangular waveguide

Plasma Science and Technology 2017年第10期19卷 70-74页

作者： h SOBhANI h r sabouhi S FEILI E DADAr Young researchers and Elite Club Qom Branch Islamic Azad University Department of Electrical Engineering Hormoz Branch Islamic Azad University Department of Physics Shahid Bahonar University Faculty of Economic Mofid University

here a new scheme for mode filtering is proposed. Based on the ponderomotive force effect,propagation of the microwave dual-mode through a plasma-filled metallic rectangular waveguide is investigated. To excite the TE_（20） mode in a rectangular waveguide, the existence of fundamental modes is unavoidable. To filter the destructive mode（TE_（10））, the waveguide is filled with a collisional plasma. Based on the coupling effect, the energy of this destructive TE_（10） mode is transferred to the TE_（20） mode. The proposed structure acts like a mode convertor. The TE_（10） mode become more attenuated and instead the TE_（20） mode is amplified. The plasma filled rectangular waveguide acts as a mode filtering tool.

关键词： mode filtering mode convertor collisional plasma ponderomotive force

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Influence of B source materials on the synthesis of TiB_2-Al_2O_3 nanocomposite powders by mechanical alloying

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International Journal of Minerals,Metallurgy and Materials 2013年第12期20卷 1214-1220页

作者： Majid Abdellahi Javad heidari rahman sabouhi Materials Engineering Department Islamic Azad University

An Al2O3-TiB2 nanocomposite was successfully synthesized by ball milling of Al, TiO2 and two B source materials of B2O3 （system （1）） and h3BO3 （system （2））. Phase identification of the milled samples was examined by Xray diffraction. The morphology and microstructure of the milled powders were monitored by scanning electron microscopy and transmission electron microscopy. It was found that the formation of this composite was completed after 15 and 30 h of milling time in systems （1） and （2）, respectively. More milling energy was required for the formation of this composite in system （2） due to the lubricant properties of haBO3 and also its decomposition to hBO2 and B2O3 during milling. On the basis of X-ray diffraction patterns and thermodynamic calculations, this composite was formed by highly exothermic mechanically induced self-sustaining reactions （MSr） in both systems. The MSr mode took place around 9 h and 25 h of milling in systems （1） and （2）, respectively. At the end of milling （15 h for system （1） and 30 h for system （2）） the grain size of about 35-50 nm was obtained in both systems.

关键词： nanocomposites powders alumina titanium diboride mechanical alloying

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