检索结果-南通市图书馆

Coor.ination of dual setting.over.ur.ent r.lays in micr.g.id with optimally deter.ined r.lay char.cter.stics for.dual oper.ting.modes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pr.tection and Contr.l of Moder. Power.Systems 2022年第1期7卷 64-81页

作者： r.g.vendr. Tiwar. ravindra kumar Sing. Nir.j kumar Choudhar. Electr.cal Eng.neer.ng.Depar.ment MNNITAllahabadPayagrajUPIndia

Fault cur.ent mag.itude in a micr.g.id depends upon its mode of oper.tion,namely,g.id-connected mode or.islanded *** on the type of fault in a g.ven mode,separ.te pr.tection schemes ar. g.ner.lly *** the chang. in micr.g.id oper.ting.mode,the pr.tection scheme needs to be modified which is uneconomical and time *** this paper.a novel optimal pr.tection coor.ination scheme is pr.posed,one which enables a common optimal r.lay setting.which is valid in both oper.ting.modes of the *** this con-text,a common optimal pr.tection scheme is intr.duced for.dual setting.dir.ctional over.ur.ent r.lays(DOCr.)using.a combination of var.ous standar. r.lay *** with the two var.ables,i.e.,time multiplier.setting.TMS)and plug.setting.PS)for.conventional dir.ctional over.ur.ent r.lay,dual setting.DOCr. ar. aug.ented with a thir. var.able of r.lay char.cter.stics identifier.r.I),which is r.sponsible for.selecting.optimal r.lay char.cter.stics fr.m the standar. r.lay char.cter.stics accor.ing.to the IEC-60255 *** r.lay coor.ination pr.blem is for.ulated as a mixed-integ.r.nonlinear.pr.g.amming.MINLP)pr.blem,and the setting. of r.lays ar. optimally deter.ined using.the g.netic alg.r.thm(g.)and the g.ey wolf optimization(g.O)*** validate the super.or.ty of the pr.-posed pr.tection scheme,the distr.bution par.s of the IEEE-14 and IEEE-30 bus benchmar. systems ar. consider.d.

关键词： Plug.setting Time multiplier.setting Pr.tection coor.ination Over.ur.ent r.lay Coor.ination time inter.al

Fabr.-Pr.t based nar.ow band imag.r.for.solar.filament obser.ations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

r.sear.h in Astr.nomy and Astr.physics 2016年第1期16卷 79-88页

作者： Sajal kumar Dhar. Belur.ravindra r.vinder.kumar Banyal Indian Institute of Astr.physics Bangalore-560034 India

We have r.cently developed a nar.ow band imag.r.NBI） using.an air.g.p based Fabr.-P′er.t（FP） inter.er.meter.at the Indian Institute of Astr.physics, Bang.lor.. Nar.ow band imag.ng.is achieved by using.an FP inter.er.meter.wor.ing.in combination with an or.er.sor.ing.pr.-filter. The NBI can be tuned to a differ.nt waveleng.h position on the line pr.file by chang.ng.the plate separ.tion of the FP. The inter.er.meter.has a 50 mm clear.aper.ur. with a bandpass of ～247.8 m ？A and a fr.e spectr.l r.ng. of～5.3 ？A at λ = 656.3 nm. The developed NBI is used to obser.e the solar.filament in the Hα *** instr.ment is being.used to imag. the Sun at chr.mospher.c heig.t and it is also able to scan the Hα spectr.l line pr.file at differ.nt waveleng.h positions. We have also made Doppler.velocity maps at chr.mospher.c heig.t by taking.the blue and r.d wing.imag.s at ±176 m ？A waveleng.h positions separ.tely away fr.m the line center.of the spectr.l line. In this paper. we pr.sent a descr.ption of the NBI including.lab test r.sults of individual components and some initial obser.ations car.ied out with this instr.ment.

关键词： instr.mentation: inter.er.meter. -- instr.mentation: spectr.g.aphs -- methods: obser.ational-- Sun: chr.mospher. -- Sun: filaments/pr.minences

A r.pid and Convenient Synthetic r.ute to Novel 1,5-Benzodiazepine Der.vatives of 5-Methyl-3-phenyl-2-oxo-△^4-1,3,4-oxadiazolines fr.m ρ-Acetylphenylsydnone and Their.Phar.acolog.cal Activity

在线全文

学校读者我要写书评

暂无评论

Chinese Jour.al of Chemistr. 2006年第1期24卷 79-84页

作者： KAMBLE,ravindra r. SUDHA, Belag.r.S. Depar.ment of Chemistr. and Food Science Yuvaraja's College University of Mysore Mysore-570 005 India

A simple and hig. yielding.method for.the integ.ation of 1,5-benzodiazepines integ.ated with 5-methyl- 2-oxo-3-phenyl-△^4-1,3,4-oxadiazolines in 75%-90% yield by micr.wave ir.adiation is devised. Micr.wave-acceler.ted r.action was compar.d with ther.al method. All the compounds wer. char.cter.zed by physical, analytical and spectr.l （Ir. 1^H NMr. MS） data. Title compounds wer. scr.ened for.pr.liminar. phar.acolog.cal activities.

关键词： ρ-acetylphenylsydnone 1,3-dipolar.cycloaddition 1,5-diazepine Michael addition micr.wave ir.adiation ther.al method

Elemental var.ations in g.acier.cr.oconites of Indian Himalaya and Spitsber.0}n,Ar.tic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

g.oscience Fr.ntier. 2017年第6期8卷 1339-1347页

作者： Shiv Mohan Sing. kumar Avinash Par.anand Shar.a ravindra Uttam Mulik Ajay kumar Upadhyay r.sik ravindra Ear.h System Science Or.0}nisation National Centre for Antarctic and Ocean ResearchHeadland SadaGoa403804India National r.sear.h Centr. for.g.apes Pune412307India Ministr. of Ear.h Sciences Prithvi BhavanIMD CampusOpp.India Habitat CentreLodi RoadNew Delhi110003India

Cr.oconite samples wer. collected fr.m two differ.nt climatic domains i.e.,the Sutr. Dhaka g.acier.wester. Himalaya India and Svalbar. g.acier.,the Spitsber.0}n,Ar.tic,to under.tand the elemental sour.e and elemental deposition *** data of g.ochemical analysis sug.est that the Himalayan cr.oconite samples accumulate hig.er.concentr.tions as compar.d to the cr.oconite samples of the Ar.tic *** concentr.tion of lithophile elements(Cs,Li,r. and U)was r.cor.ed hig.er.in the cr.oconite holes of the Himalayas,especially,in the lower.to the hig.er.par.s of the g.acier.wher.as,lower.concentr.tions wer. r.cor.ed in the Ar.tic *** elements in the Himalayan cr.oconites ar. enr.ched in As and Bi while the Ar.tic cr.oconite samples show a hig.er.concentr.tion of Bi,Pb and *** hig.er.concentr.tions ar. r.sponsible for.influencing.the ecosystem and in human health r.lated *** elements(Co,Fe,Mn and Ni)show hig. concentr.tions in the Himalayan samples,wher.as,the Ar.tic samples show minor.var.ations and low elemental concentr.tion in these elements,*** addition,a few elements,such as Ag.Mg.and Ca show hig.er.concentr.tion in the Himalayan g.acier.*** also occur. in hig. concentr.tions in Ar.tic g.acier.samples.r.mode factor.analysis of the Himalayas(Ar.tic)samples indicate that the elements ar. distr.buted in four.thr.e)factor.,explaining.89%(90%)of the var.ance in their.elemental *** Factor.1 sug.ests statistically sig.ificant positive loading. for.most of the lithophile,chalcophile and sider.phile elements of the "Himalayan" and the Ar.tic cr.oconite *** sample-wise factor.scor. distr.bution shows a consider.ble var.ation in the sampling.locations along.the g.acier. of both the *** 2 and 3,demonstr.te insig.ificant loading.for.most of the elements,except statistically sig.ificant positive loading.in some of the elements of the both,Himalayan and Ar.tic "cr.oconites".The hig.er.el

关键词： Cr.oconite Elemental concentr.tion Factor analyses Himalaya Spitsber.0}n

A Novel Multi-objective Pr.tection Coor.ination Scheme for.a Micr.g.id with Optimal Deployment of Dual-setting.r.COV Based r.lays

在线全文

学校读者我要写书评

暂无评论

Pr.tection and Contr.l of Moder. Power.Systems 2024年第4期9卷 23-38页

作者： Pr.veen kumar g.pta Pr.yanshul Nir.njan Nir.j kumar Choudhar. Nitin Sing. ravindra kumar Sing. the Depar.ment of Electr.cal Eng.neer.ng Motilal Nehru National Institute of Technology AllahabadPrayagraj 211004India

r.lay coor.ination is cr.cial in electr.cal power.systems to pr.tect ag.inst malfunctions and damag. caused by unexpected events like shor. *** addr.ss the challeng. associated with the r.ver.e dir.ction of fault cur.ent,dual-setting.DS)dir.ctional over.cur.ent r.lays have evolved but failed to pr.vide pr.per.coor.ination dur.ng.chang.s of load,g.ner.tion,and *** the meantime,with the incr.asing.number.of DS r.lays,the total r.lay oper.ting.time tends to ***,this paper.pr.poses a pr.tection scheme based on the optimal deployment of conventional and dual-setting.r.te of chang. of voltag.(DS-r.COV)r.lays in distr.bution *** holds tr.e for.var.ing.networ. topolog.es and is unaffected by var.ations in load and *** objective of the pr.posed scheme is to ensur. r.liable and efficient pr.tection ag.inst faults in distr.bution systems by minimizing.the over.ll oper.ting.time with the optimal number.of DS-r.COV *** pr.posed pr.tection scheme’s per.or.ance is evaluated for.differ.nt coor.ination time inter.al values as well as in differ.nt micr.g.id *** paper.outlines the desig. and implementation of the pr.posed pr.tection scheme which is validated on the modified IEEE 14-bus system using.simulations in Matlab/Simulink.

关键词： Coor.ination time inter.al DS-r.COV r.lay multi-objective optimization optimal-deployment pr.tection coor.ination

Sedimentar. sour.es and pr.cesses in the easter. Ar.bian Sea:Insig.ts fr.m envir.nmental mag.etism,g.ochemistr. and clay miner.log.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

g.oscience Fr.ntier. 2016年第2期7卷 253-264页

作者： kumar Avinash P.John Kur.an Anish kumar War.ier.r.Shankar.T.C.Vineesh r.sik ravindra Ear.h System Science Or.0}nization National Centre for Antarctic and Ocean Research(ESSO-NCAOR)Ministry of Earth Sciences(MoES) Depar.ment of Mar.ne g.olog. Mangalore University Ear.h System Science Or.0}nization Ministry of Earth Sciences(MoES)

The spatial distr.bution patter.s of sur.icial sediment samples fr.m differ.nt sedimentar. domains （shallow to deep-sea r.g.ons） of the easter. Ar.bian Sea wer. studied using.sediment pr.xies viz. envir.nmental mag.etism, g.ochemistr., par.icle size and clay miner.log.. Hig.er.concentr.tions of mag.etic miner.ls （hig. Xlf） wer. r.cor.ed in the deep-water.sediments when compar.d with the shallow water.sediments. The mag.etic miner.log. of one of the shallow water.samples is influenced by the pr.sence of bacter.al mag.etite as evidenced fr.m the XAr./Xlf VS. XAr./Xfd biplot. However. the other.samples ar. catchment-der.ved. The hig. cor.elation documented for.Xlf, anhyster.tic r.manent mag. netisation （XAr.） and isother.al r.manent mag.etisation （Ir.） with Al indicates that the deep-sea sur.lcial sediments ar. influenced by ter.ig.nous fluxes which have been pr.bably der.ved fr.m the souther. Indian r.ver., the Sindhu （the Indus） and the Nar.ada-Tapti r.ver.. A lower.Mn concentr.tion is r.cor.ed in the upper.slope sediments fr.m the oxyg.n minimum zone （OMZ） but a hig.er.Mn/AI r.tio is documented in the lower.slope and deep-sea sediments. Clay miner.ls such as illite （24-48.5%）, chlor.te （14.1-34.9%）, smectite （10.6-28.7%） and kaolinite （11.9-27.5%） dominate the sediments of shallow and deep-sea r.g.ons and may have been der.ved fr.m differ.nt sour.es and tr.nspor.ed by fluvial and aeolian ag.nts. Or.0}nic car.on （OC） data indicate a low concentr.tion in the shallow/shelf r.g.on （well oxyg.nated water.conditions） and deeper.basins （incr.ased bottom-water.oxyg.n concentr.tion and low sedimentation r.te）. Hig. OC concentr.tions wer. documented in the OMZ （ver. low bottom-water.oxyg.n concentr.tion with hig. sedimentation r.te）. The calcium car.onate concentr.tion of the sur.ace sediments fr.m the continental shelf and slope r.g.ons （〈 1800 m） up to the Chag.s-Laccadive r.dg. show hig.er.concentr.tions （aver.g. - 58%） when compar.d to deep basin sediments （aver.g. - 44%）.

关键词： Mag.etic miner.ls Major.elements Or.0}nic car.on Calcium car.onate Ter.ig.nous fluxes Easter. Ar.bian Sea

Softwar. Oper.tional Pr.file Based Test Case Allocation Using.Fuzzy Log.c

在线全文

学校读者我要写书评

暂无评论

Inter.ational Jour.al of Automation and computing 2007年第4期4卷 388-395页

作者： K.Sar.vana kumar ravindra Babu Misr. r.liability Eng.neer.ng.Center Indian Institute of TechnologyKharagpur 721302India

Softwar. oper.tional pr.file （SOP） is used in softwar. r.liability pr.diction, softwar. quality assessment, per.or.ance analysis of softwar., test case allocation, deter.ination of ＂when to stop testing.＂ etc. Due to the limited data r.sour.es and lar.0} effor.s r.quir.d to collect and conver. the g.ther.d data into point estimates, r.luctance is obser.ed by the softwar. pr.fessionals to develop the SOP. A fr.mewor. is pr.posed to develop SOP using.fuzzy log.c, which r.quir.s usag. data in the for. of ling.istics. The r.sulting.pr.file is named fuzzy softwar. oper.tional pr.file （FSOP）. Based on this wor., this paper.pr.poses a g.ner.lized appr.ach for.the allocation of test cases, in which occur.ence pr.bability of oper.tions obtained fr.m FSOP ar. combined with the cr.ticality of the oper.tions using.fuzzy infer.nce system （FIS）. Tr.ditional methods for.the allocation of test cases do not consider.the application in which softwar. oper.tes. This is intuitively incor.ect. To solve this pr.blem, allocation of test cases with r.spect to softwar. application using.the FIS model is also pr.posed in this paper.

关键词： Softwar. r.liability softwar. oper.tional pr.file cr.ticality fuzzy log.c test case allocation.

Disseminated cysticer.osis pr.senting.with bilater.l pr.ptosis: A case r.por.

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Jour.al of Tr.pical Medicine 2019年第7期12卷 337-338页

作者： ravindra kumar g.r.2}Neer.j kumar Imr.n r.zvi Har.eep Sing. Malhotr. Depar.ment of Neur.log. King George’s Medical University Uttar Pradesh

r.tionale: Disseminated cysticer.osis is char.cter.zed by pr.sence of cysts in multiple body or.0}ns, like br.in, skin, eyes, muscles and r.r.ly hear. and *** concer.s: A 22-year.old man pr.sented with bilater.l pr.ptosis of 1-year.dur.tion. He also had two episodes of cysticer.osis encephalitis. In the second episode of encephalopathy, the patient ***: Disseminated ***: Cor.icoster.ids(Initially intr.venous dexamethasone 0.4 mg.kg.day for.2 weeks, followed by or.l pr.dnisolone 1.0 mg.kg.day).Outcomes: The patient died of cysticer.osis encephalitis appr.ximately 2 months ***: Disseminated cysticer.osis in our.case pr.sented only with pr.ptosis as he had ver. heavy infestation of the br.in and eyes. Heavy lar.al infestation in a patient with disseminated cysticer.osis can be life-thr.atening.

关键词： Neur.cysticer.osis Cysticer.osis encephalitis Pr.ptosis

Var.ability of Nonionellina labr.dor.ca Dawson in Sur.ace Sediments fr.m Kong.fjor.en,West Spitsber.0}n

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta g.olog.ca Sinica(Eng.ish Edition) 2011年第3期85卷 549-558页

作者： Suhas SHETYE r.hul MOHAN Sunil kumar SHUKLA Sudhakar.MAr.THADU r.sik ravindra National Centr. for.Antar.tic and Ocean r.sear.h g.a India Ministr. of Ear.h Sciences New Delhi India

Kong.fjor.en is a fjor. in Spitsber.0}n（Svalbar. ar.hipelag.）that lies adjacent to both Ar.tic and Atlantic water.masses and is ther.for. a suitable site to under.tand the effects of climate chang. on *** decipher.the effect of the later.l advection of tr.nsfor.ed Atlantic water.（TAW）within the fjor.,spatial var.ations of for.minifer.l tests,their.test size var.ations and stable isotopic composition（δ^（13）C andδ^（18）O）in the sur.ace sediments wer. *** or.0}nic car.on and textur.l analyses wer. also car.ied *** dominant benthic for.minifer. included Nonionellina labr.dor.ca,Elphidium excavatum,Cassidulina r.nifor.e,Quinqueloculina stalker. and Islandiella *** labr.dor.ca was the pr.dominant species in the outer.fjor.,wher.as Elphidium excavatum and Cassidulina r.nifor.e wer. dominant in the inner.*** or.0}nic car.on and the test size of Nonionellina labr.dor.ca within the fjor. wer. hig.ly cor.elated（r.0.97）and both showed a decr.asing.tr.nd towar.s the inner.*** on the distr.bution and abundance of Nonionellina labr.dor.ca as well as temper.tur. pr.files,we sug.est that ther. was little or.no major.chang. in the later.l advection of TAW within the fjor. in the immediate past.

关键词： West Spitsber.0}n Cur.ent Kong.fjor.en Nonionellina labr.dor.ca g.ain size or.0}nic car.on stable isotopes temper.tur.