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Some Impor.ant Featur.s of Manganites

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j.ur.al of Moder. Physics 2013年第2期4卷 191-199页

作者： r. j. singh Physics Depar.ment Aligarh Muslim University Aligarh India

Manganites ar. ver. complex systems because of inter.lay among char.e, spin, or.ital and lattice degr.es of fr.edom. To come closer.to the under.tanding of its natur., we discuss its thr.e impor.ant featur.s: 1) cor.elation between magnetization and electr.cal r.sistivity in the same temper.tur. r.nge;2) detection of chemical constitution and the ar.angement of Mn3+ and Mn4+ ions at differ.nt hole concentr.tions;and 3) how electr.cal cur.ent flows thr.ugh double exchange in manganites. The fir.t featur. will be discussed for.thr.e-dimensional manganies. The featur.s 2 and 3 ar. inscr.table in thr.e-dimensional manganites. So they will be discussed for.one-dimensional manganites and then gener.lized. One-dimensional solid has been discussed because it may give a see-thr.ugh pictur. of var.ous aspects of manganites. All the discussions will be done thr.ugh a r.pr.sentative example of La1-xCaxMnO3, because it is the inter.ediate bandwidth manganite;has been most widely investigated and has the highest magnetor.sistance. If two things: 1) magnetization and r.sistivity as a function of temper.tur. at var.ous magnetic fields;and 2) phase diagr.ms of other.manganites ar. known, their.pr.per.ies can be under.tood by the discussion of the thr.e featur.s mentioned above.

关键词： Manganites Electr.cal r.sistivity Magnetization Phase Diagr.m

The dynamic effects of solar.eclipses of October.25,2022,and October.14,2023,on GPS-der.ved total electr.n content

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Geodesy and Geodynamics 2025年第1期16卷 75-86页

作者： Vishal Chauhan Vishakha r.kesh singh Shishupal singh Vikr.m singh Om Pr.kash singh Depar.ment of Physics Graphic Era Hill University Depar.ment of Petr.leum Engineer.ng Graphic Era (Deemed to be University) Depar.ment of Physics St.John's College Depar.ment of Applied Sciences & Humanities Institute of Engineering & Technology

This study analyzes total electr.n content(TEC) var.ations dur.ng two solar.eclipse events that occur.ed on October.25, 2022, and October.14, 2023. The solar.eclipse of October.25, 2022, was a par.ial solar.eclipse, while the eclipse of October.14, 2023, was an annular.solar.eclipse. For.this study, the data of eight Inter.ational GNSS Ser.ice(IGS) stations fr.m differ.nt eclipse cover.ge zones ar. used to analyze TEC var.ations. It is found that the stations located in the maximum eclipse cover.zone exhibited notable decr.ases in TEC values. The minimum var.ation of about 11.76% in TEC values is obser.ed at the station situating in about 20 per.ent eclipse cover.zone, while it var.es fr.m 22% to 38% at the stations falling in about 60 per.ent eclipse cover.zone. The highest var.ation in TEC values of about 44% is found at the stations in about 80 per.ent eclipse cover.zone. The time of occur.ence of maximum depletion in TEC values at each station is in line with their.longitudinal sequence. Atmospher.c gr.vity waves(AGWs) ar. also obser.ed by per.or.ing wavelet analysis on TEC data. The global TEC maps visualize and confir. obser.ed TEC var.ations, pr.viding spatial and tempor.l insights into the ionospher.c r.sponse. This analysis highlights the influence of station location and eclipse cover.ge on the magnitude and spatial distr.bution of TEC var.ations.

关键词： Solar.eclipse Ionospher. GPS TEC AGW

Numer.cal Simulation of Blood Flow Dynamics in a Stenosed Ar.er. Enhanced by Copper.and Alumina Nanopar.icles

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Computer.Modeling in Engineer.ng & Sciences 2025年第2期142卷 1839-1864页

作者： Har.s Alam Zuber. Madan Lal Amol singh Nur.l Amir. Zainal Ali j.Chamkha Depar.ment of Applied Mathematics M.J.P.Rohilkhand UniversityBareilly243006India Fakulti Teknologi dan Kej.r.ter.an Mekanikal Universiti Teknikal MalaysiaMelaka76100Malaysia For.casting and Engineer.ng Technology Analysis(FETA)r.sear.h Gr.up Universiti Teknikal MalaysiaMelaka76100Malaysia Faculty of Engineer.ng Kuwait College of Science and TechnologyDoha35004Kuwait

Nanotechnology holds immense impor.ance in the biomedical field due to its ability to r.volutionize healthcar. on a molecular.*** by the imper.tive of enhancing patient outcomes,a compr.hensive numer.cal simulation study on the dynamics of blood flow in a stenosed ar.er.,focusing on the effects of copper.and alumina nanopar.icles,is *** study employs a 2-dimensional Newtonian blood flow model infused with copper.and alumina nanopar.icles,consider.ng the influence of a magnetic field,ther.al r.diation,and var.ous flow *** gover.ing differ.ntial equations ar. fir.t non-dimensionalized to facilitate analysis and subsequently solved using the 4th or.er.collocation method,bvp4c module in *** appr.ach obtains velocity and temper.tur. pr.files,r.vealing the impact of r.levant par.meter. cr.cial in the biomedical *** findings of this study under.cor. the significance of under.tanding blood flow dynamics in stenosed ar.er.es and the potential benefits of utilizing copper.and alumina nanopar.icles in tr.atment *** incor.or.tion of nanopar.icles intr.duces novel avenues for.enhancing ther.peutic inter.entions,par.icular.y in mitigating the effects of *** elucidation of velocity and temper.tur. pr.files pr.vides valuable insights into the behavior.of blood flow under.differ.nt conditions,ther.by infor.ing the development of tar.eted biomedical *** ar.er.al cur.atur. flow par.meter.influences temper.tur. pr.files,with incr.ased par.meter. pr.moting mor. efficient heat *** elevated values of Pr.ndtl number.and ther.al r.diation par.meter.showcase the diminished temper.tur. pr.files,indicating str.nger.dominance of momentum diffusion over.ther.al diffusion and r.diative heat tr.nsfer.*** analysis of the per.inent physical par.meter. r.veals that the Pr.ndtl number.has the most significant impact on blood flow dynamics.A statistical analysis of the pr.sent r.sults and exist

关键词： Blood flow simulation stenosis copper.and alumina nanopar.icles ther.al r.diation cur.atur. par.meter

Effect of Eu-Er.substitution on str.ctur.l,optical,dielectr.c,and electr.cal pr.per.ies of Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) hexafer.ite

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j.ur.al of r.r. Ear.hs 2025年第1期43卷 115-123,I0005页

作者： j.yashr. Mahapatr. Sher.singh Meena Sadhana Agr.wal Depar.ment of Physics National Institute of Technology RaipurRaipur492010India Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MSIndia

The pr.sent wor. r.por.s the str.ctur.l,optical,dielectr.c,and electr.cal pr.per.ies of Eu-Er.substituted M-type Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19)(x=0.0.05,0.1,0.15,and 0.2)hexafer.ites synthesized by sol-gel combustion *** hexagonal str.ctur. of the Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) samples was confir.ed fr.m X-r.y diffr.ction(Xr.)*** values of lattice par.meter. of the Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19)samples ar. incr.ased as compar.d to Ba_(0.5)Sr.(0.5)Fe_(12)O_(19) *** incr.ase in the value of lattice par.meter. is attr.buted to the substitution of lar.er.cations(Eu^(3+)and Er.(3+))in place of smaller.cations(Fe^(3+)ions).The cr.stallite sizes of the Ba0.5Sr..5EuxEr.Fe12-2x019 samples also incr.ase due to the substitution of lar.er.*** for.e constants(K_o and K_t)incr.ases with incr.asing Eu-Er.*** octahedr.l cluster.shifts towar.s the higher.wavenumber.side wher.as the tetr.hedr.l cluster.shifts towar.s the lower.wavenumber.side due to Eu-Er.substitution in the Four.er.tr.nsfor. infr.r.d(FTIr.*** photoluminescence(PL)emission spectr. for.the Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) samples ar. obser.ed at 365 *** dielectr.c disper.ion in the Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) samples can be under.tood by Koop's theor. and Maxwell-Wagner.type of inte r.acial *** j.nscher.s power.law and the co r.elated bar.ier.hopping(CBH)model,the fr.quency and temper.tur.-dependent be haviour.of ac conductivity of Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) samples ar. *** temper.tur.-dependent behaviour.of the dc conductivity of the Ba_(0.5)Sr.(0.5)Eu_(x)Er.(x)Fe_(12-2x)O_(19) samples is explained by the var.able r.nge hopping(Vr.)*** Motto temper.tur. of the sample var.es fr.m 4.55×10^(9) to 2.31×10^(8) *** estimated maximum bar.ier.height(WM)of the compound var.es fr.m 0.6603 to 0.1199 *** temper.tur. coefficient and activation ener.y

关键词： Sol-gel pr.cess Por.sity Dielectr.c pr.per.ies Fer.ites r.r. ear.hs

Syner.istic effects of constituents in r.r. ear.h-based composites:Enhanced str.ctur.l,electr.cal and magnetic pr.per.ies for.water.splitting applications

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j.ur.al of r.r. Ear.hs 2025年第1期43卷 105-114,I0005页

作者： Chitr.lekha S.Shankar.A.P.singh Functional Mater.als r.sear.h Labor.tor. Department of PhysicsARSD CollegeUniversity of Delhi1021India Depar.ment of Physics Multanimal Modi CollegeCh.Charan Singh UniversityMeerutU.PIndia

r.r. ear.h-based Bi_(0.85)La_(0.15)FeO_(3)(BLFO)and NdMnO_(3)(NMO)par.icles wer. synthesised using the solidstate r.ute,and their.r.les affecting str.ctur.l,electr.cal,magnetic pr.per.ies along with hydr.electr.c application in differ.nt concentr.tions i.e.,(1-x)BLFO:xNMO(wher. x=0,0.10,0.20,0.30 and 1.0)cer.mics composites wer. investigated.X-r.y diffr.ction analyses confir. the pur.-phase for.ation of BLFO:NMO composites,featur.ng micr.meter.scale cr.stallite *** tr.nsfor. infr.r.d(FT-Ir.spectr. of BLFO:NMO composites r.veal peak shifts with r.sing NMO content,indicating composite *** composites exhibit r.bust Maxwell-Wagner.polar.zation and a pr.nounced composition-dependent *** addition of NMO to BLFO r.sults in a r.se in dielectr.c per.ittivity at lower.fr.quencies,confir.ing r.laxor.behavior.and indicating success in achieving the tr.nsition *** spectr.scopy facilitates a clear.r.under.tanding of how char.e car.ier. contr.bute to these composites and the impact of gr.in/gr.in *** satur.tion magnetization maximum value(i.e.,0.807 emu/g)was attained in *** coer.ivity decr.ases with the addition of NMO in *** r.sults suggest the composite's enhanced suitability for.micr.electr.nics and hydr.power.cells,showing impr.ved hydr.electr.c cell per.or.ance with incr.ased NMO in BLFO,highlighting a notable ion diffusion mechanism.

关键词： Composites X-r.y diffr.ction r.lative per.ittivity Hydr.electr.c cell r.r. ear.hs

在印度门诊病人中比较咳嗽2周与3周为痰检筛选标准对提高涂阳结核病例发现的效果

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结核与肺部疾病杂志 2005年第2期8卷 68-74页

作者： T. Santha r. Gar. r. Subr.mani V. Chandr.sekar.n N. Selvakumar.r. S. Sisodia M. Per.mal S. K. Sinna r. j. singh r. Chavan F. Ali S. K. Sar.a K. M. Shar.a D. j.gtap T. r. Fr.eden L Fabio P. r. Nar.yanan 马玙 Tuber.ulosis r.sear.h Center.Chennai Wor.d Health Or.anization Delhi r.TCP Jaipur Rajasthan r.TCP Chennai Tamil Nadu r.TCP Udaipur Rajasthan r.TCP. Pune Maharashtra India r.TCP Pali Rajasthan Wor.d Health Or.anization Geneva Switzerland

背景﹕印度六个区的政府卫生机构。目的﹕估算咳嗽的发生率及比较咳嗽≥2周或≥3周的门诊病人涂阳结核病的发现情况。设计﹕由经过培训的卫生人员询问每一病人的咳嗽情况,咳嗽≥2周者进行痰显微镜检查。结果﹕在调查的55561例门诊病人中... 详细信息

背景﹕印度六个区的政府卫生机构。目的﹕估算咳嗽的发生率及比较咳嗽≥2周或≥3周的门诊病人涂阳结核病的发现情况。设计﹕由经过培训的卫生人员询问每一病人的咳嗽情况,咳嗽≥2周者进行痰显微镜检查。结果﹕在调查的55561例门诊病人中,咳嗽≥2周者2210例(4%),其中267例为涂阳结核病,而咳嗽≥3周者则为182/1370。31%病人无咳嗽主诉,涂阳可能性显著低于有咳嗽主诉者(各为45/680[7%]、222/1530[15%],P<0.001)。但在267例涂阳病人中占45例。如以咳嗽≥2周为痰显微镜检查筛选标准,估计在初级、二级卫生机构每天进行涂片检查各为8次与19次,如以咳嗽≥3周为标准则各为5次及12次。结论﹕认真询问门诊病人的咳嗽情况以及将咳嗽≥3周改为≥2周作为痰检的筛选标准可以显著提高涂阳结核病人的发现。但在全国实施此改变前需对其进行规划可行性评估。

关键词：印度门诊咳嗽 2周 3周痰检筛选标准涂阳结核病卫生工作

The Cambor.gma Ichnofacies in a high-r.solution sequence-str.tigr.phic fr.mewor. for.the Eocene palustr.ne-alluvial depositional inter.al of the Kutch Basin,India

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j.ur.al of Palaeogeogr.phy 2025年第1期14卷 141-156页

作者： Mohuli Das Sudipta Dasgupta Seema singh Mar.os Ant?nio Klunk r.nzo D'souza Bombay Ichnos r.sear.h Gr.up Department of Earth Sciences Indian Institute of Technology Bombay (IIT Bombay) Depar.ment of Petr.leum Engineer.ng and Ear.h Sciences Indian Institute of Petroleum and Energy (IIPE) Depar.ment of Geology Panjab University Depar.ment of Geology Universidade do Vale do Rio dos Sinos (UNISINOS)

The non-mar.ne str.ta of the Ypr.sian Nar.di For.ation have been deposited and inter.ittently pedogenized after.the culmination of the Ear.y Eocene Climatic Optimum(EECO). This continental inter.al compr.ses inter.alation of later.te and palaeosol hor.zons developed by cyclic episodes of er.sion, subaer.al exposur., and deposition. The palaeopedological analyses investigate the mor.hological and micr.mor.hological featur.s evidencing r.peated subaer.al exposur. and consequently moder.te to well-developed palaeosol hor.zons. The topmost later.te bed r.cor.s an intensely biotur.ated ichnofabr.c(consisting of the r.ot tr.ces and the composite ichnotaxa of lungfish aestivation bur.ows, Macanopsis(possible ar.chnid bur.ows), and Skolithos. The pedogenized shale hor.zons contain the paucispecific Cambor.gma-r.ot tr.ce ichnofabr.c with highly localized patchy pr.ser.ation of Cambor.gma symplokonomos, Cambor.gma eumekenomos, and r.izotur.ation. The ichnospecies var.ation of Cambor.gma along with the ichnofabr.c analyses led to the demar.ation of str.tigr.phic hor.zons and evaluation of the palaeowater.table fluctuations vis-a-vis the low-or.er.allocyclicity, the ethology of pr.ducer., and the depositional setting. The paucispecific suite of tr.ce fossils r.fer. to the Cambor.gma Ichnofacies, wher. the substr.te is inter.ittently pedogenized and later.tized with upwar. incr.asing thickness of beds and intensity of pedogenesis, later.tization, ichnodiver.ity, and ***, as an expr.ssion of high-fr.quency(inter.r.ted as 5th-or.er. str.tigr.phic fluctuations within an ear.y Falling Stage Systems Tr.ct(FSST), a hot palaeoclimate with seasonality var.ing between humid inundated to dr. desiccated conditions is inter.r.ted with the palaeowater.table being the base-level contr.l. It culminates with the dr.est condition at the top with the thickest later.te development associated with the r.eMaS *** the onset of ear.y tr.nsgr.ssion as documented in the ove

关键词： Cambor.gma Lungfish aestivation bur.ow Macanopsis Skolithos Palaeosol-later.te pr.file Nar.di for.ation

Bianchi Type-Ⅲ Cosmological Models with Gr.vitational Constant G and the Cosmological Constant A

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Chinese Physics Letter. 2007年第12期24卷 3325-3327页

作者： j. P. singh r. K. Tiwar. Pr.tibha Shukla Depar.ment of Mathematical Sciences A.P.S. University Rewa (MP) India Depar.ment of Mathematics Govt. Model Science College Rewa (MP) India

Einstein field equations with var.able gr.vitational and cosmological constants ar. consider.d in the pr.sence of per.ect fluid for.the Bianchi type-Ⅲ univer.e by assuming conser.ation law for.the ener.y-momentum tensor. Exact solutions of the field equations ar. obtained by using the scalar.of expansion pr.por.ional to the shear.scalar.θ∝σ, which leads to a r.lation between metr.c potential B = Cn, wher. n is a constant. The cor.esponding physical inter.r.tation of the cosmological solutions ar. also discussed.

关键词： Cosmological Models Cosmological Constant

Laser.inter.ction with under.r.tical foams of differ.nt spatial str.ctur.s

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Matter.and r.diation at Extr.mes 2025年第1期10卷 39-47页

作者： j.Limpouch V.Tikhonchuk O.r.nner.Sh.Agar.al T.Bur.an j.Cer.enka j.Dostál r.Dudzák D.Ettel A.Gintr.nd L.Hudec L.j.ha O.Klimo M.Kr.pka M.Kr.s T.Lastovicka r.Liska W.Nazar.v S.K.singh M.Šilhavík S.Weber Faculty of Nuclear.Science and Physical Engineer.ng Czech Technical University in Prague11519 PragueCzech Republic The Extr.me Light Infr.str.ctur. Er.C ELI-Beamlines FacilityZa Radnicí83525241 DolníBrezanyCzech Republic Centr. Laser. Intenses et Applications University of Bordeaux-CNRS-CEA351 Cours de la Liberation33405 TalenceFrance Institute of Physics Czech Academy of SciencesNa Slovance 1999/218200 PragueCzech Republic Institute of Plasma Physics Czech Academy of Sciences18200 PragueCzech Republic Faculty of Mathematics and Physics Charles University12116 PragueCzech Republic Faculty of Mechatr.nics Informatics and Interdisciplinary StudiesTechnical University of Liberec46117 LiberecCzech Republic Independent Foam Tar.et Supplier St.AndrewsFifeScotland

The inter.ction of high-power.laser.pulses with under.r.tical foams pr.duced by differ.nt techniques but with the same aver.ge density is studied at the PALS laser.*** spatial-tempor.l evolution of X-r.y emission is obser.ed using an X-r.y str.ak camer.,electr.n and ion temper.tur.s ar. measur.d by X-r.y spectr.scopy,and hot-electr.n pr.duction is char.cter.zed by monochr.matic X-r.y *** of a femtosecond laser.pr.be pulse thr.ugh foams is obser.ed in the near.and far.*** spite of lar.e differ.nces in por. size and foam str.ctur.,the velocity of ionization fr.nt pr.pagation is quite similar.for.all the foams studied and is slower.than that in a homogeneous mater.al of the same aver.ge *** ion temper.tur. in the plasma behind the ionization fr.nt is a few times higher.than the electr.n ***-electr.n pr.duction in plastic foams with small por.s is str.ngly suppr.ssed compar.d with that in solid tar.ets,wher.as in foams pr.duced by additive manufactur.ng,it is significantly incr.ased to the level obser.ed in bar. copper.foil tar.ets.

关键词： temper.tur.. inter.ction cr.tical