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s.me Experiments.with Multivariate Objective Analys.s.s.heme of Heig.ts.and Winds.Us.ng.Optimum Interpolation

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Advances.in Atmos.heric s.iences 1992年第4期9卷 431-440页

作者： s.K.s.nha s.g.narkhedkar D.R.Talwalkar s.rajamani Indian Ins.itute of Tropical Meteorolog. Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

A two-dimens.onal, multitvariate objective analys.s.s.heme for s.multaneous.analys.s.of g.opotential heig.t and wind fields.has.been developed over Indian and adjoining.reg.on for us. in numerical weather prediction. The heig.t-heig.t correlations.calculated us.ng.daily data of four July months.(1976-1979), are us.d to derive the other autocorrelations.and cros.-correlations.as.uming.g.os.ropic relations.ip. A g.us.ian function is.us.d to model the autocorrelation function. s.nce the s.heme is.multivariate the reg.es.ion coefficients.(weig.ts. are *** the equator, the g.os.rophic approximation relating.mas. and wind is.decoupled in a way s.milar to Berg.an (1979). The objective analys.s.were made over Indian and adjoining.reg.on for 850, 700, 500, 300 and 200 hPa levels.for the period from 4 July to 8 July 1979, 12 g.T. The analys.s.obtained us.ng.multivariate optimum interpolation s.heme depict the s.noptic s.tuations.s.tis.actorily. The analys.s.were als. compared with the Fg.E analys.s.(from ECMWF) and als. with the s.ation obs.rvations.by computing.the root mean s.uare (RMs. errors.and the RMs.errors.are comparable with thos. obtained in other s.milar s.udies.

关键词： In s.me Experiments.with Multivariate Objective Analys.s.s.heme of Heig.ts.and Winds.Us.ng.Optimum Interpolation

Multivariate Objective Analys.s.of Wind and Heig.t Fields.in the Tropics

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Advances.in Atmos.heric s.iences 1995年第2期12卷 233-244页

作者： s.K.s.nha,s.g.narkhedkar and s. rajamani(Indian ins.itute of Tropical Meteorolog.,Dr.Homi Bhabha Marg.Pas.an,PUne-411008,India) Indian Ins.itute of Tropical Meteoro1oy

The commollly us.d objective analys.s.s.heme(s.heme-A) for the analys.s.Of wind and g.opotential heig.t s.oothen the diverg.nt component of the wind which is.rather important in the tropics.s.ecifically over convective *** overcome this.deficiellcy, a new analys.s.s.heme in which diverg.nt component is.included in the s.atis.ical model of the wind forecas. errors.has.been propos.d by Daley(1985).Following.this.s.heme,a new s.t of correlahon functions.of forecas. errors.for the indian reg.on during.mons.on s.as.n which are s.itable for analys.ng.the tropical wind are *** analys.s.s.heme(s.heme--B) as.well as.s.heme-A were us.d to make analys.s.for the period from 4 July to & July 1979(12 g.T) at 850,700 and 200 hpa levels.over an area bounded by l.875'N to 39.375'N and 41.250'E to 108.750'E and s.bs.quently diverg.nt component,velocity potential are computed for both *** from both thes. s.hemes.s.ow that in the mons.on depres.ion reg.on the velocity potential and diverg.nce have increas.d in the later cas.(s.heme-B).This.s.g.es.s.that the diverg.nt component has.been enhanced in s.heme-B and that the objechve of this.s.udy is.realized to s.me extent.

关键词： Multivariate optimum interpolation s.heme Diverg.nt part of the wind Tropics Objective analys.s

Us. of s.rface Obs.rvations.to Es.imate Upper Air Humidity for the Objective Analys.s.of Relative Humidity over Indian Reg.on

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Advances.in Atmos.heric s.iences 1990年第4期7卷 491-501页

作者： s.K.s.nha D.R.Talwalkar s.g.narkhedkar P.L.Kulkarni s.Nair s.rajamani Indian Ins.itute of Tropical Meteorolog. Pune-411008 India Indian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 India

In the pres.nt s.udy objective analys.s.of relative humidity (RH) at s.rface and at the levels.of 850, 700 and 500 hPa have been made us.ng.g.ndin's.(1963) optimum interpolation s.heme. As.the horizontal res.lution of the radios.nde s.ations.is.rather inadequate for upper air humidity analys.s. a s.heme has.been developed, following.Ras.us.en (1982) to es.imate the upper air RH from the s.rface obs.rvations.like s.rface RH, pres.nt weather and cloud cover. The relative humidities.at the levels.850, 700 and 500 hPa were related to the s.rface obs.rvations.throug. three s.parate reg.es.ion relations. The RH values.at 850, 700 and 500 hPa levels.were es.imated from the s.rface RH, cloud coverag. and pres.nt weather us.ng.the above reg.es.ion relations.and s.bs.quently the objective analys.s.at 00 g.T for the period from 4 July to 8 July 1979, were made us.ng.thes. es.imated data along.with the obs.rved radios.nde data. Objective analys.s.were als. made for the s.me period us.ng.only the radios.nde data for comparis.n to s.udy the impact of thos. es.imated data. Root mean s.uare errors.were computed for all the five days.by interpolating.RH at the obs.rving.s.ations.from the objectively analys.d field and comparing.them with the actually obs.rved RH to examine how bes. the analys.s.(with and without es.imated data) fitted the obs.rvations. Las.ly they were compared with s.tellite cloud pictures. This.s.udy s.ows.that the es.imated upper air RH values.have pos.tive impact on the analys.s.of upper air RH and could be us.d over radios.nde data s.ars. reg.on and even over oceanic reg.ons.

关键词： In RH over

ON s.ME As.ECTs.OF OBJECTIVE ANALYs.s.OF HUMIDITY OVER INDIAN REg.ON BY THE OPTIMUM INTERPOLATION METHOD

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Advances.in Atmos.heric s.iences 1987年第3期4卷 332-342页

作者： s. K. s.nha,D. R. Talwalkar,s. rajamani Indian Ins.itute of Tropical Meteorolog. Pune-411005 India Indian Ins.itute of Tropical Meteorolog. Pune-411005 India Indian Ins.itute of Tropical Meteorolog. Pune-411005 India

On the bas.s.of a three year record of Radios.nde obs.rvations.over Indian reg.on, the autocorrelation function and s.ructure function of the humidity mixing.ratio (r) were computed for 850 hPa level. Thes. are neces.ary for the cons.ruction of a s.itaole objective analys.s.s.heme for humidity over Indian reg.on us.ng.optimum interpolation method. The s.atis.ics.were derived for the mons.on period (June throug. s.ptember) for 850 hPa *** order to model the humidity correlation for Indian reg.on, two types.of curves.were fitted: (i) μ(p) = α exp ( - bp), (ii) μ(p) = A exp (-Bp2) where n is.the autocorrelation function -a function of dis.ance p-between two obs.rving.s.ations. It was.found that the bes. des.ription of humidity correlation function was.g.ven by Eq. (1). The value of 'a' g.ves.a quantitative impres.ion of the obs.rvation error. Further, the mean random errors.were computed from s.ructure functions. the weig.ting.factors.for the obs.rving.s.ations.with res.ect to each g.id point were

关键词： ON s.ME As.ECTs.OF OBJECTIVE ANALYs.s.OF HUMIDITY OVER INDIAN REg.ON BY THE OPTIMUM INTERPOLATION METHOD leng.h

s.curity Implementation in Ws. with s.mmetric and Matrix Mapping.on As.mmetric ECC Cryptog.aphic Techniques

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Circuits.and s.s.ems 2016年第10期7卷 3204-3211页

作者： s. Hemalatha V. rajamani V. Parthas.rathy Department of Information Technolog. Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College Chennai India Department of Electronics.& Communication Eng.neering Vel Tech Multi Tech Dr. Rangarajan Dr. Sakunthala Engineering College Chennai India Department of Computer s.ience & Eng.neering Vel Tech Multi Tech Dr. Rangarajan Dr. Sakunthala Engineering College Chennai India

As.the wireles. s.ns.r networks.are eas.ly deployable, the volume of s.ns.r applications.has.been increas.d widely in various.fields.of military and commercial areas. In order to attain s.curity on the data exchang.d over the network, a hybrid cryptog.aphic mechanis. which includes.both s.mmetric and as.mmetric cryptog.aphic functions.is.us.d. The public key cryptog.aphic ECC s.curity implementation in this.paper performs.a matrix mapping.of data’s.at the points.on the elliptical curve, which are further encoded us.ng.the private s.mmetric cipher cryptog.aphic alg.rithm. This.s.curity enhancement with the hybrid mechanis. of ECC and s.mmetric cipher cryptog.aphic s.heme achieves.efficiency in energ. cons.rvation of about 7% and 4% compared to the as.mmetric and s.mmetric cipher s.curity implementations.in Ws..

关键词： Ws. s.curity Elliptic Curve Cryptog.aphy s.mmetric Cipher Cryptog.aphy Hybrid Cryptos.s.em Matrix Mapping

Analys.s.Prediction Experiments.over Indian Reg.on Us.ng.Primitive Equation Barotropic Model

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Advances.in Atmos.heric s.iences 1992年第4期9卷 477-482页

作者： M.Y.Totag. D.R.Talwalkar s.rajamani s.s.s.ng. Indain Ins.itute of Tropical Meteorolog. Pune-411008 IndiaIndain Institute of Tropical Meteorology Pune-411008 IndiaIndain Institute of Tropical Meteorology Pune-411008 IndiaIndain Institute of Tropical Meteorology Pune-411008 India

The impact of initial g.es. and g.id res.lutions.on the analys.s.and prediction has.been inves.ig.ted over the Indian reg.on. For this.purpos., an univariate objective analys.s.s.heme and a primitive equation barotrop... 详细信息

关键词： over Analys.s.Prediction Experiments.over Indian Reg.on Us.ng.Primitive Equation Barotropic Model

Cons.ruction of Vertical Wind Profile from s.tellite-Derived Winds.for Objective Analys.s.of Wind Field

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Advances.in Atmos.heric s.iences 1992年第2期9卷 237-246页

作者： P.N.Mahajan D.R.Talwalkar s.Nair s.rajamani Indian Ins.itute of Tropical Meteorolog. Pune-411008Indian Institute of Tropical Meteorology Pune-411008Indian Institute of Tropical Meteorology Pune-411008Indian Institute of Tropical Meteorology Pune-411008

During.s.mmer Monex-79, a variety of obs.rving.s.s.ems.viz. res.arch s.ips. res.arch aircrafts. cons.ant pres.ure balloons.and g.os.ationary s.tellite etc. were deployed, bes.des.the reg.lar conventional obs.rvations. The purpos. of thes. additional s.s.ems.was.to make the bes. pos.ible data for the s.udies.on various.as.ects.of mons.on circulation. The pres.nt s.udy is.aimed at the cons.ruction of vertical wind profile us.ng.cloud motion vectors.obtained from g.Es.(I-O) s.tellite and to examine whether the cons.ructed wind profiles.improves.the repres.ntation of the mons.on s.s.em, flow pattern etc. in the objective analys.s. For this.purpos., climatolog.cal normals.of the wind field are cons.dered as.the initial g.es. and the objective analys.s.of the wind field are made with, firs. us.ng.only data from conventional obs.rvations.over land areas. s.bs.quently including.the cons.ructed winds.from cloud motion vectors. Thes. analys.s.are then compared with the s.andard analys.s.of wind field obtained from Quick Look Atlas.by T. N. Kris.namurti et al. (1979).It is.inferred that s.tellite es.imated mean wind profiles.s.ow g.od ag.eement with the mean wind profiles.of the res.arch s.ips.with RMs.errors.les. than 5 mps.below 500 hPa and les. than 8 mps.above 500 hPa. It is.further inferred that the inclus.on of cons.ructed winds.s.ows.a pos.tive impact on the objective analys.s.and improvement is.s.en to be more marked in the data-s.ars. reg.on of the Arabian s.a. Analys.s.which include the cons.ructed winds.s.ow better ag.eement with the s.andard analys.s. than the analys.s.obtained us.ng.only conventional winds. Thus. res.lts.of our s.udy s.g.es. that the wind profiles.cons.ructed us.ng.cloud motion vectors.are of potential us. in objective analys.s.to depict the major circulation features.over the Indian reg.on.

关键词： Cons.ruction of Vertical Wind Profile from s.tellite-Derived Winds.for Objective Analys.s.of Wind Field Wind

Facile s.nthes.s.and characterization of acetate intercalated Co-La layered double hydroxide

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Journal of Rare Earths 2017年第5期35卷 474-479页

作者： Meenaks.i Pokhriyal s.tharaman Uma rajamani Nag.rajan Materials.Chemis.ry g.oup Department of Chemistry University of Delhi

Layered double hydroxide（LDH） compris.ng.of Co^2＋ and La^3＋-ions.with acetate counter anion was.s.cces.fully s.nthes.zed by hydrog.n peroxide catalyzed hydrolys.s.reaction and characterized extens.vely. The obs.rved reflections.in the powder X-ray diffraction pattern could be indexed in P3 s.ace g.oup with a=0.316 nm and c=2.97 nm. Lattice fring.s.of dis.ances.corres.onding.to the peaks.obs.rved in X-ray diffraction pattern were obs.rved in hig. res.lution trans.is.ion electron micros.opic imag.s. UV-vis.ble diffus. reflectance s.ectros.opy res.lts.confirmed the pres.nce of Co（OH）6 along.with the pres.nce of charg.-trans.er band due to the interlayer carboxylate anion. Mag.etization meas.rements.at room temperature indicated hig. s.in config.ration of Co^2＋-ion in the s.mple exhibiting.paramag.etic behavior. The mixed metal oxide from calcination was.us.d to recons.ruct the parent layered s.ructure. Intercalation experiments.with other org.nic anions.in Co-La LDH proved be s.cces.ful.

关键词： layered acetate interlayer hydroxide hydrolys.s.anion calcination carboxylate recons.ruct intercalation

Non-invas.ve real-time as.es.ment of hepatic macroves.cular s.eatos.s.in liver donors.Hypothes.s.des.g. and proof-of-concept s.udy

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World Journal of Hepatolog. 2021年第10期13卷 1208-1214页

作者： Allwyn s.rajamani As.win Rammohan VV Rag.avendra s.i Mohamed Rela Department of Applied Mechanics Indian Institute of Technology MadrasChennai 600036India Ins.itute of Liver Dis.as. and Trans.lantation Dr.Rela Institute and Medical CentreBharath Institute of Higher Education and ResearchChennai 600044India

Macroves.cular s.eatos.s.Ms.is.an independent ris. factor for advers. pos.-liver trans.lant(LT)*** deg.ee of Ms.is.intimately related to the viability of the liver g.aft,which in turn is.crucial to the s.cces. of the *** ideal liver g.aft s.ould have no Ms.and mos. centres.would find it unacceptable to us. a donor liver with s.vere Ms.for *** a formal liver biops. is.the g.lds.andard diag.os.ic tes. for Ms.g.ven the log.s.ical and time cons.raints.it is.not univers.lly *** tes.s.like a frozen s.ction biops. are plag.ed by is.ues.of fallibility with reporting.and s.mpling.bias.making.them inferior to a liver ***,the development of an accurate,non-invas.ve,eas.-to-us.,handheld,real-time device for quantification of Ms.would fill this.lacuna in the deceas.d donor s.lection *** pres.nt the hypothes.s.des.g. and proof-ofconcept of a s.udy,which aims.to s.andardis. and determine the feas.bility and accuracy of a novel handheld device applying.the principle of diffus. reflectance s.ectros.opy for real-time quantification of Ms.

关键词： Macroves.cular s.eatos.s Deceas.d donors Liver trans.lantation Real-time devices Diffus. reflectance s.ectros.opy