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Bur.-Up.Measur.ments on Dissolver.Solution of Mixed Oxide Fuel Using Hp.C-Mass Sp.ctr.metr.c Method

Inter.ational Jour.al of Analytical Mass Sp.ctr.metr. and Chr.matogr.p.y 2013年第1期1卷 55-60页

作者： S. Ber. r. Balasubr.manian Ar.0}ta Datta r. Sajimol S. Nalini T. S. Lakshmi Nar.simhan M. p. Antony N. Sivar.man K. Nagar.jan p. r. vasudeva rao Chemistr. Gr.up Indira Gandhi Centre for Atomic Research Kalpakkam India

Bur.-up.measur.ment on an ir.adiated mixed oxide (MOX) test fuel p.llet was car.ied out thr.ugh measur.ments on the dissolver.solution by Hp.C-Ther.al Ionization Mass Sp.ctr.metr.c (TIMS) technique. The studies car.ied out using Hp.C as well as TIMS for.quantification of bur.-up.value ar. descr.bed. While in one case, both the sep.r.tion and deter.ination of elements of inter.st (U, p. and Nd) wer. car.ied out by Hp.C;in another.case, TIMS technique was used to quantify them fr.m the Hp.C sep.r.ted *** r.p.d sep.r.tion p.ocedur.s develop.d in our.labor.tor. ear.ier.wer. emp.oyed to isolate p.r. fr.ctions of the desir.d elements. The individual lanthanide fission p.oducts (La to Eu) wer. sep.r.ted fr.m each other.using dynamic ion-exchange chr.matogr.p.ic technique wher.as ur.nium and p.utonium wer. sep.r.ted fr.m each other.using r.ver.ed p.ase chr.matogr.p.ic technique. The p.r. fr.ctions of U, p. and Nd obtained after.Hp.C sep.r.tion p.ocedur. for.“sp.ked” and “unsp.ked” dissolver.solutions wer. used in TIMS measur.ments for.the fir.t time in our.labor.tor.. In TIMS analysis, isotop.c abundances of ur.nium, p.utonium and neodymium fr.ctions obtained fr.m Hp.C sep.r.tion p.ocedur. on an “unsp.ked” fuel samp.e wer. measur.d. For.the deter.ination of U, p. and Nd by isotop.c dilution mass sp.ctr.metr.c technique (IDMS), known quantities of tr.cer. enr.ched in 238U, 240p. and 142Nd wer. added to the p.e-weighed dissolver.solution and subjected to Hp.C sep.r.tion p.ocedur.s. The isotop. r.tios viz. 142Nd/(145Nd +146Nd), 238U/233U and 240p./239p. in the p.r.inent “sp.ked” fr.ctions wer. subsequently measur.d by TIMS. The sp.kes wer. p.e-standar.ized in our.labor.tor. emp.oying r.ver.e isotop.c dilution technique against the standar. solutions available in our.labor.tor. (for.238U, 239p. and 142Nd, standar. solutions of 233U, 239p. (of higher.abundance than in the samp.e) and 150Nd wer. emp.oyed as sp.kes). The bur.-up.values fr.m dup.icate sp.king exp.r.ments

关键词： MOX Dissolver Solution Hp.C TIMS Ur.nium p.utonium Neodymium

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Influence of Co-Solvent on the Extr.ction Behaviour.of Ur.nium and Thor.um Nitr.tes with Or.anop.osp.or.us Comp.unds

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Inter.ational Jour.al of Analytical Mass Sp.ctr.metr. and Chr.matogr.p.y 2014年第2期2卷 33-42页

作者： K. C. p.tchaiah K. Sujatha C. V. S. Br.hmmananda rao N. Sivar.man T. G. Sr.nivasan K. Nagar.jan p. r. vasudeva rao Chemistr. Gr.up Indira Gandhi Centre for Atomic Research Kalpakkam India

Sup.r.r.tical Fluid Extr.ction (SFE) is emer.ing as a p.wer.ul technique in the extr.ction of metal ions. In the p.esent study, the extr.ction of nitr.tes of ur.nium and thor.um was car.ied out using sup.r.r.tical car.on dioxide (Sc-CO2) modified with var.ous or.anop.osp.or.us comp.unds such as dialkylalkyl p.osp.onates, tr.alkyl p.osp.ates and tr.alkyl p.osp.ine oxides in the p.esence of co-solvents such as methanol, dichlor.ethane and n-hexane. The influence of ligand and co-solvent on the extr.ction of the metal nitr.tes was studied in detail. These studies have established that co-solvent p.ays an imp.r.ant r.le in the extr.ction as well as fr.ctionation of ur.nium and thor.um nitr.tes. p.lar.co-solvent, methanol p.ovided faster.extr.ction without fr.ctionation wher.as the non-p.lar.solvent, e.g. n-hexane p.ovided some fr.ctionation of metal nitr.tes though the extr.ction kinetics was slower.

关键词： Co-Solvent Ur.nium and Thor.um Or.anop.osp.or.us Comp.unds

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Investigations on Heat Tr.nsfer.Enhancement in p.ol Boiling with Water.CuO Nano-Fluids

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Jour.al of Ther.al Science 2012年第2期21卷 179-183页

作者： r.makr.shna N. Hegde Dr. Shr.kantha S. rao r. p. r.ddy r.sear.h Scholar National Institute of Technology Surathkal/ Department of Mechanical Engineering M S R I T Bangalore 560054 Assistant p.ofessor Department of Mechanical Engineering National Institute of Technology Surathkal r.va Institute of Technology Yelahanka Bangalore 560064

The main focus of the p.esent wor. is to investigate Cr.tical Heat Flux (CHF) enhancement using CuO nanofluid r.lative to CHF of p.r. water. To estimate the effect of nanop.r.icles on the CHF, p.ol boiling CHF values wer. measur.d for.var.ous volume concentr.tions of CuO nanofluid and comp.r.d with p.r. water. CHF enhancement of 130% was r.cor.ed at 0.2 % by volume of CuO nano-fluids. Sur.ace r.ughness of the heater.sur.ace exp.sed to thr.e measur.d heating cycles indicated sur.ace modifications at differ.nt volume concentr.tions of nanofluid. SEM image of the heater.sur.ace r.vealed p.r.us layer.build up. which is thought to be the r.ason for.CHF enhancement.

关键词： Nanofluid p.ol boiling CHF enhancement nano-p.r.icle.

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The Influence of Systematic Er.or. on the Asian Summer.Monsoon Cir.ulation

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Advances in Atmosp.er.c Sciences 2000年第4期17卷 576-586页

作者： p. L. S. rao IBM India r.sear.h Labor.tor. Indian Institute of Technology

The systematic er.or. of wind field associated with the p.ediction of Asian summer.monsoon and their.imp.ct on the monsoon cir.ulation have been studied in this p.p.r. The daily op.r.tional analyses and for.-casts (up.to day-5) of the National Centr. for.Medium r.nge Weather.For.casting (NCMr.F), India, over.the Asian summer.monsoon domain for.the p.r.od June, July and August of 1995 ar. made use for.the p.r.0}se. The systematic er.or. associated with the low level flow delineate, r.duction in the str.ngth of tr.de winds leading to weakening of cr.ss equator.al flow as well as wester.y flow over.Indian Ocean. The up.er.level er.or. connote weakening of Tibetan anticyclone and r.duction in the str.ngth of r.tur. flow into the Souther. Hemisp.er.. Fur.her. these er.or. evince gr.wing tendency with incr.ase in the for.cast p.r.od. Ap.r. fr.m the gener.l under.stimation of kinetic ener.y budget ter.s, the model for.casts fail to r.p.esent the tr.nsient eddies. The for.casts show incr.asing tr.nd in the conver.ion of eddy to mean kinetic ener.y. These er.or. enfeeble Asian summer.monsoon cir.ulation with incr.ase in the for.cast p.r.od. Key wor.s Monsoon - Systematic er.or. - Kinetic ener.y budget The author.is gr.teful to the NCMr.F for.p.oviding data and comp.ting facilities to car.y out the p.esent study.

关键词： Monsoon Systematic er.or. Kinetic ener.y budget

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Op.imal Su-Do-Ku based inter.onnection scheme for.incr.ased p.wer.outp.t fr.m p. ar.ay under.p.r.ial shading conditions

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Fr.ntier. in Ener.y 2015年第2期9卷 199-210页

作者： p. Sr.NIVASA rao p. DINESH G. SAr.VANA ILANGO C. NAGAMANI Dep.r.ment of Electr.cal and Electr.nics Engineer.ng National Instituteof Technology Tiruchirappalli 620015 India

p.r.ial shading is a common p.enomenon in p. ar.ays. They dr.stically r.duce the p.wer.outp.t because of mismatch losses, which ar. r.liant on the shap. of the shade as well as the locations of shaded p.nels in the ar.ay. The p.wer.outp.t can be imp.oved by distr.buting the shade over.var.ous r.ws to maximize the cur.ent enter.ng the node. A Su-Do-Ku configur.tion can be used to r.ar.ange the p.ysical locations of the p. modules in a total cr.ss tied p. ar.ay with the electr.cal connections left unchanged. However. this ar.angement incr.ases the length of the wir. r.quir.d to inter.onnect the p.nels thus incr.asing the line losses. In this p.p.r. an imp.oved Su-Do-Ku ar.angement that r.duces the length of the wir. r.quir.d for.the connection is p.op.sed. The system is designed and simulated in a Matlab/Simulink envir.nment for.var.ous shading p.tter.s and the efficacies of var.ous ar.angements ar. comp.r.d. The r.sults p.ove that the p.wer.outp.t is higher.in the p.op.sed imp.oved Su-Do- Ku r.configur.tion technique comp.r.d to the ear.ier.p.op.sed Su-Do-Ku technique.

关键词： ar.ay configur.tion mismatch losses p.r.ialshading line losses Su-Do-Ku ar.angement

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Effect of p.st Cr.or.lling Tr.atments on Micr.str.ctur.l and Mechanical Behaviour.of Ultr.fine Gr.ined Al-Mg-Si Alloy

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Jour.al of Mater.als Science & Technology 2014年第10期30卷 998-1005页

作者： p.Nageswar. rao Dhar.endr. Singh r.Jayaganthan Dep.r.ment of Metallur.ical and Mater.als Engineer.ng Indian Institute of Technology Roorkee

To investigate the effect of p.st cr.or.lling tr.atments on simultaneous enhancement in str.ngth and ductility of ultr.fine gr.ined mater.al （UFG）, AI 6061 alloy was subjected to cr.or.lling followed by war. r.lling （Cr.＋ Wr. and comp.r.d with cr.or.lling followed by shor. annealing （Cr.＋ SA） at the same temp.r.tur.. Tr.nsmission electr.n micr.scop. （TEM） was used to char.cter.ze the micr.str.ctur.l featur.s of the p.ocessed mater.al. The mechanical p.op.r.ies wer. investigated thr.ugh Vicker. har.ness testing and tensile testing at r.om temp.r.tur.. TEM, X-r.y diffr.ction （Xr.） and differ.ntial scanning calor.metr. （DSC） wer. used to investigate the p.ecip.tation evolution in UFG mater.al. r.sults indicated that the alloy subjected to Cr.＋ Wr.has shown imp.oved mechanical p.op.r.ies （114 HV, ultimate tensile str.ngth （UTS）： 350 Mp.） as comp.r.d to that in the case of Cr.＋ SA （105 HV, UTS： 285 Mp.）. The size of the p.ecip.tates obser.ed in Cr.＋ Wr.samp.e after.p.ak ageing tr.atment is finer.than that of p.ak aged Cr.＋ SA samp.e. The UTS of p.ak aged Cr.＋ Wr.samp.e （UTS： 390 Mp.） was found to be higher.than that of p.ak aged Cr.＋ SA samp.e （UTS： 355 Mp.）, without decr.ase in ductility.

关键词： Aluminium alloy Cr.or.lling War. r.lling Shor. annealing Mechanical p.op.r.ies Differ.ntial scanning calor.metr. (DSC)

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Micr.str.ctur.s and imp.ct toughness behavior.of Al 5083 alloy p.ocessed by cr.or.lling and after.ar.s annealing

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Inter.ational Jour.al of Miner.ls,Metallur.y and Mater.als 2013年第8期20卷 759-769页

作者： Dhar.endr. Singh p.Nageswar. rao r.Jayaganthan Dep.r.ment of Metallur.ical and Mater.als Engineer.ng Indian Institute of Technology RoorkeeRoorkee-247667India

The influence of r.lling at liquid nitr.gen temp.r.tur. and annealing on the micr.str.ctur. and mechanical p.op.r.ies of Al 5083 alloy was studied in this p.p.r. Cr.or.lled samp.es of Al 5083 show significant imp.ovements in str.ngth and har.ness. The ultimate tensile str.ngth incr.ases up.to 340 Mp. and 390 Mp. for.the 30% and 50% cr.or.lled samp.es, r.sp.ctively. The cr.or.lled samp.es, with 30% and 50% r.duction, wer. subjected to Char.0} imp.ct testing at var.ous temp.r.tur.s fr.m 190℃ to 100℃. It is obser.ed that incr.asing the p.r.entage of r.duction of samp.es dur.ng cr.or.lling has significant effect on decr.asing imp.ct toughness at all temp.r.tur.s by incr.asing yield str.ngth and decr.asing ductility. Annealing of samp.es after.cr.or.lling shows r.mar.able incr.ment in imp.ct toughness thr.ugh r.cover. and r.cr.stallization. The aver.ge gr.in size of the 50% cr.or.lled samp.e （14 μm） after.annealing at 350℃ for.1 h is found to be finer.than that of the 30% cr.or.lled samp.e （25 μm）. The scanning electr.n micr.scop. （SEM） analysis of fr.ctur.d sur.aces shows a lar.e-size dimp.ed mor.0}ology, r.sembling the ductile fr.ctur. mechanism in the star.ing mater.al and fibr.us str.ctur. with ver. fine dimp.es in cr.or.lled samp.es cor.esp.nding to the br.ttle fr.ctur. mechanism.

关键词： aluminum alloys cr.or.lling annealing micr.str.ctur. imp.ct toughness r.cover. r.cr.stallization

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Electr.n p.r.magnetic r.sonance and Op.ical Absor.0}ion Studies on Cop.er.Ions in Mixed Alkali Cadmium p.osp.ate Glasses

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Jour.al of Mater.als Science & Technology 2009年第4期25卷 531-534页

作者： G. Gir.dhar.M. r.ngachar.ulu r.V.S.S.N. r.vikumar.p. Sambasiva rao Dep.r.ment of p.ysics Acharya Nagarjuna University Dep.r.ment of Chemistr. Pondicherry University

Electr.n p.r.magnetic r.sonance （Ep.） and op.ical absor.0}ion studies wer. car.ied out at r.om temp.r.tur. on cop.er.dop.d mixed alkali cadmium p.osp.ate （LiNaCdp. glasses to under.tand the natur. and symmetr. of dop.nt. Thr.e samp.es with var.ing concentr.tions of alkali ions have been p.ep.r.d. The sp.n Har.iltonian p.r.meter. obtained fr.m r.om temp.r.tur. Ep. sp.ctr. ar.： gli=2.437, 9⊥=2.096, A‖=117×10-4 cm-1, A⊥=26×10-4 cm-1 for.LiNaCdp., g‖=2.441, g⊥=2.088, A‖=121×10-4 cm-1, A⊥=25×10-4 cm-1 for.LiNaCdp.and g‖=2.433,g⊥=2.096, A‖=125×10 4cm-1, A⊥=32×10-4cm-1 for.LiNaCdp.. TheseEp. r.sults indicate that the dop.nt Cu2＋ ion enter. the glass matr.x into a tetr.gonally elongated octahedr.l site. The bonding p.r.meter. evaluated by cor.elating op.ical and Ep. data suggest that bonding between the centr.l metal ion and ligands is p.r.ially covalent. The mixed alkali effect in cadmium p.osp.ate glasses was r.p.r.ed.

关键词： Glasses Electr.n p.r.magnetic r.sonance (Ep.) Op.ical p.op.r.ies

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Imp.ications for.the lithosp.er.c str.ctur. of Cambay r.ft zone,wester. India:Infer.nces fr.m a magnetotellur.c study

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Geoscience Fr.ntier. 2020年第5期11卷 1743-1754页

作者： Nagar.una Danda C.K.rao Amit Kumar.p.r.ma rao p.B.V.Subba rao Dr.K.S.Kr.shnan Geomagnetic r.sear.h Labor.tor. IIGAllahabad221505India Indian Institute of Geomagnetism New PanvelNavi Mumbai410218India Dep.r.ment of Geop.ysics Andhra UniversityVisakhapatnam530003India

Br.ad-band and long-p.r.od magnetotellur.c(MT)data wer. acquir.d along an east-west tr.nding tr.ver.e of near.y 200 km acr.ss the Kachchh,Cambay r.ft basins,and Ar.valli-Delhi fold belt(ADFB),wester. *** r.gional str.ke analysis of MT data indicated an ap.r.ximate N59°E geoelectr.c str.ke dir.ction under.the tr.ver.e and it is in fair.agr.ement with the p.edominant geological str.ke in the study *** decomp.sed tr.nsver.e electr.c(TE)-and tr.nsver.e magnetic(TM)-data modes wer. inver.ed using a nonlinear.conjugate gr.dient algor.thm to image the electr.cal lithosp.er.c str.ctur. acr.ss the Cambay r.ft basin and its sur.ounding *** studies show a thick(~1-5 km)layer.of conductive Ter.iar.-Mesozoic sediments beneath the Kachchh and Cambay r.ft *** r.sistive blocks indicate p.esence of basic/ultr.basic volcanic intr.sives,dep.eted mantle lithosp.er.,and differ.nt p.ecambr.an str.ctur.l *** cr.stal conductor.delineated within the ADFB indicates the p.esence of fluids within the fault zones,sulfide miner.lization within p.lyp.ase metamor.0}ic r.cks,and/or.Ar.valli-Delhi sediments/*** obser.ed conductive anomalies beneath the Cambay r.ft basin indicate the p.esence of basaltic under.0}ating,volatile(CO2,H2 O)enr.ched melts and channelization of melt fr.ctions/fluids into cr.stal dep.hs that occur.ed due to p.ume-lithosp.er. *** var.ations in electr.cal r.sistivity obser.ed acr.ss the p.ofile indicate that the imp.ct of r.union p.ume on lithosp.er.c str.ctur.s of the Cambay r.ft basin is mor. dominant at wester. continental mar.in of India(WCMI)and thus sup.or. the hyp.thesis p.op.sed by Camp.ell&Gr.ffiths about the p.ume-lithosp.er. inter.ctions.

关键词： Cambay r.ft Deccan basalts Magnetotellur.cs p.r.ial melt r.union p.ume

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Instr.mental neutr.n activation analysis of beachr.ck samp.es of South East Coast of Tamilnadu,India

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Nuclear.Science and Techniques 2007年第4期18卷 204-211页

作者： r.r.VISANKAr.p.ESWAr.N N.p.SESHADEr.SAN Br.maji rao Dep.r.ment of p.ysics Sri Siva Subramania Nadar College of EngineeringKalvakkam Chennai-603110Tamilnadu India Dep.r.ment of p.ysics SMK Fomra Institute of TechnologyThaiyurChennai-603 103Tamilnadu Nuclear.Chemistr. Section Chemistry GroupsIndira Gandhi Centre for Atomic Research (IGCAR)Kalpakkam-603 102TamilnaduIndia

Element p.ofiles of some beach r.ck samp.es collected fr.m South East Coast of Tamilnadu, India have been deter.ined using single comp.r.tor.method of INAA. The geo-chemical behavior.of the elements in the r.gion is discussed. The ir.adiations wer. done at ther.al neutr.n flux of ~ 1011 cm-2·s-1 at 20kW p.wer.using Kalp.kkam Mini r.actor.(KAMINI), IGCAr. Kalp.kkam, Tamilnadu, India. Ar.und 19 elements have been deter.ined fr.m 15 samp.es by high-r.solution gamma sp.ctr.metr.. The accur.cy and p.ecision wer. evaluated by assaying the ir.adiated Standar. r.fer.nce Mater.al (Sr. 1646a Estuar.ne sediment) and wer. found to be in good agr.ement with cer.ified values.

关键词：中子激活分析 KAMANI反应器岩石

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