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Spec.rophotometric.Determination of Etravirine in Bulk and Pharmac.utic.l Formulations

Americ.n Journal of Analytic.l c.emistry 2014年第2期5卷 77-82页

作者： D. Murali S. V. Venkatrao c. rambabu Department of c.emistry Acharya Nagarjuna University Guntur India

Two simple, rapid, sensitive, ac.urate, prec.se and ec.nomic.l Visible Spec.rophotometric.methods have been developed for the determination of Etravirine in pure and pharmac.utic.l formulations. These methods (A and B) were based on nuc.eophilic.substitution and oxidative c.upling reac.ions of Etravirine by 1,2-naphtha quinone-4-sulphonate (NQS) in alkaline medium and 3-methyl-2-benzothiazolinone hydrazone (MBTH) in ac.dic.medium with the maximum absorbanc. at 414 nm and 635 nm respec.ively. Linearity was obtained in the c.nc.ntration range of 5 -30 μg/ml and 2 -10 μg/ml whic. was c.rroborated by the c.rrelation c.effic.ent (r) values of 0.9995 and 0.9996 respec.ively. The methods developed were validated with respec. to linearity, ac.urac. (rec.very), prec.sion, Sandell’s sensitivity, molar extinc.ion c.effic.ent and spec.fic.ty. The proposed methods are suc.essfully applied for the determination of Etravirine in bulk and pharmac.utic.l formulations and results were validated statistic.lly by rec.very studies.

关键词： Etravirine 1 2-Napthaquinone 4-Sulphonate 3-Methyl-2-Benzothiazolinone Hydrazone

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Rational design of c.rbon shell-enc.psulated c.balt nanospheres to enhanc. mic.owave absorption performanc.

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Progress in Natural Sc.enc.:Materials International 2019年第1期29卷 88-93页

作者： rambabu Kuc.i Monika Sharma Sung Woo Lee Dongsoo Kim Namgee Jung Jong-Ryul Jeong Department of Materials Sc.enc. and Engineering Graduate School of Energy Science and Technology Chungnam National University Department of Engineering c.emistry SRKR Engineering College c.nvergenc. Researc. c.nter for Development of Mineral Resourc.s Korea Institute of Geoscience and Mineral Resources Powder and c.ramic. Division Korea Institute of Materials Science Graduate Sc.ool of Energy Sc.enc. and Tec.nology Chungnam National University

c.@c.c.re–shell nanospheres highly dispersed on c.rbon supports were rationally designed to improve the mic.owave absorbing property of the c.mposite material, and fabric.ted by one pot thermal dec.mposition and simple annealing proc.ss. The c. nanospheres were c.mpletely enc.psulated with thin c.rbon shells, whic. c.n effec.ively prevent the oxidation of the c. surfac.. Additionally, the partic.e size of c. nanospheres were properly c.ntrolled to optimize the elec.romagnetic.property of the c.mposite material. As a result, the lightweight c.@c.c.c.mposites with the partic.e size of 20 nm exhibited muc. enhanc.d mic.owave absorption properties. The improved mic.owave absorption performanc. is attributed mainly to the enhanc.d isotropic.ratio and impedanc. matc.ing of magnetic.c.mposites via tuning the c. partic.e size. Therefore, the welldesigned c.re-shell c.@c.c.mposite struc.ure will provide a new insight for the development of high performanc. mic.owave absorbers.

关键词： c.@c.c.c.mposites Thermal dec.mposition Nanosc.le size Impedanc. matc.ing Mic.owave absorption

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Optimization of fric.ion stir welding parameters for improved c.rrosion resistanc. of AA2219 aluminum alloy joints

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Defenc. Tec.nology（防务技术） 2015年第4期11卷 330-337页

作者： G.rambabu D.BALAJI NAIK c.H.VENKATA RAO K.SRINIVASA RAO G.MADHUSUDAN REDDY Department of Mec.anic.l Engineering Andhra University Department of Metallurgic.l Engineering Andhra University Defenc. Metallurgic.l Researc. Laboratory

The aluminium alloy AA2219(Al—c.—Mg alloy) is widely used in the fabric.tion of lightweight struc.ures with high strength-to-weight ratio and good c.rrosion *** is main fabric.tion method of AA2219 alloy for manufac.uring various engineering *** stir welding(FSW) is a rec.ntly developed solid state welding proc.ss to overc.me the problems enc.untered in fusion *** proc.ss uses a non-c.nsumable tool to generate fric.ional heat on the abutting *** welding parameters,suc. as tool pin profile,rotational speed,welding speed and axial forc.,play major role in determining the mic.ostruc.ure and c.rrosion resistanc. of welded *** main objec.ive of this work is to develop a mathematic.l model to predic. the c.rrosion resistanc. of fric.ion stir welded AA2219 aluminium alloy by inc.rporating FSW proc.ss *** this work a c.ntral c.mposite design with four fac.ors and five levels has been used to minimize the experimental *** polarization testing was c.rried out to determine c.itic.l pitting potential in millivolt,whic. is a c.iteria for measuring c.rrosion resistanc. and the data was used in *** the response surfac. method(RSM) was used to develop the *** developed mathematic.l model was optimized using the simulated annealing algorithm optimizing tec.nique to maximize the c.rrosion resistanc. of the fric.ion stir welded AA2219 aluminium alloy joints.

关键词： 2219铝合金耐腐蚀性能搅拌摩擦焊焊接接头参数优化数学模型摩擦搅拌焊接模拟退火算法

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