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Selective microwave absorption in Nd3+ substituted barium ferrite composites

Journal of Rare Earths 2019年第12期37卷 1320-1325页

作者： Wahyu Widanarto Siti Khaeriyah Sib Krishna Ghoshal candra kurniawan Mukhtar Effendi Wahyu Tri Cahyanto Department of Physics FMIPAUniversitas JenderalSoedirmanJL dr.Soepamo 61Purwokerto53123Indonesia Department of Physicsand Laser Centre AMORGFaculty of ScienceUniversiti Teknologi MalaysiaJohor BahruSkudai81310Malaysia Research Center for Physics Indonesian Institute of Sciences(LIPI)Puspiptek Office AreaSouth TangerangBanten15314Indonesia

Microwave(MW)frequency based wireless communications and electronic devices became prospective due to several *** meet this need,a series of neodymium ions(Nd3+)substituted barium ferrite composites with composition(20)BaO:(80-x)Fe2 O3:(x)Nd2 O3(0≤x≤3 mol%)was prepared at1100℃using solid-state reaction *** evaluated the effect of various Nd3+ions contents on the surface morphology,structure,and magnetic properties of the as-synthesized barium ferrite ***,microwave reflection loss,complex permittivity and permeability were determined using the transmission/reflection line method in the X-band(8-12 GHz).SEM image of the composites shows that the surface morphology consists of rough and porous *** patterns of the un-doped composites reveal the existence of BaFe12O19(hexagonal)and Fe21.333O32(tetragonal)crystalline ***,a new hexagonal crystalline phase of Ba6 Nd2 Fe4 O15 with the crystallite sizes between 15 and 67 nm is observed due to Nd3+ions substitution in the *** saturation magnetization of the composite containing 2 mol%of Nd3+does not exhibit any significant alteration compared to the one devoid of Nd3+.The complex relative permitivity and permeability of the achieved composites enriched in Ba6 Nd2 Fe4 O15 and BaFe2 O4 phases disclose significant MW frequency *** composites also display selective MW absorption in the X-band which could be useful for diverse applications.

关键词： Neodymium doping Barium ferrite composites Magnetic properties Porosity MW reflection loss Rare earths

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Comparison of Microbubble and Air Layer Injection with Porous Media for Drag Reduction on a Self-propelled Barge Ship Model

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Journal of Marine Science and Application 2018年第2期17卷 165-172页

作者： Yanuar kurniawan T.Waskito Sigit Y.Pratama Bagus D.candra Bilmantasya A.Rahmat Department of Mechanical Engineering University of IndonesiaJakarta 16424Indonesia Undergraduate Student of Mechanical engineering University of IndonesiaJakarta 16424Indonesia

Ship resistance issues are related to fuel economy,speed,and cost *** lubrication is a promising technique for lowering hull frictional resistance as it is supposed to modify the energy in the turbulent boundary layer and thereby reduce hull *** this paper,the objective is to identify the optimum type of air lubrication using microbubble drag reduction(MBDR)and air layer drag reduction(ALDR)techniques to reduce the resistance of a 56-m Indonesian self-propelled barge(SPB).A model with the following dimensions was constructed:length L=2000 mm,breadth B=521.60 mm,and draft T=52.50 *** ship model was towed using standard towing tank experimental *** speed was varied over the Froude number range 0.11–*** air layer flow rate was varied at 80,85,and 90 standard liters per minute(SLPM)and the microbubble injection coefficient over the range 0.20–*** results show that the ship model using the air layer had the highest drag reduction up to a maximum of 90%.Based on the characteristics of the SPB,which operates at low speed,the optimum air lubrication type to reduce resistance in this instance is ALDR.

关键词： Self-propelled barge Ship resistance Air lubrication Microbubble drag reduction Air layer drag reduction

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