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Fabrication and characterization of Ti6A14V/TiB2-TiC compos.tes.by powder metallurgy method

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Rare Metals 2017年第10期36卷 806-811页

作者： M. Anandajothi s. ramanathan V. Ananthi P. Narayanas.my Department of Manufacturing Engineering Annamalai University Chidambaram Tamil Nadu 608 002 India Phys.cs.s.ction Faculty of Engineering and Technology Annamalai University Chidambaram Tamil Nadu 608 002 India Department of Mechanical Engineering Kamaraj College of Engineering and Technology Virudhunagar Tamil Nadu 626 001 India

Titanium matrix （Ti6Al4V） compos.tes.rein- forced with TiB2 and TiC were produced through powder metallurgy method. The effect of addition of both TiB2 and TiC with different contents.（2.5 wt%, 5.0 wt% and 7.5 wt%） on the dens.ty, micros.ructure and hardnes. properties.of titanium matrix was.inves.igated. The s.ze dis.ributions.of the matrix alloy and reinforcement particles.were meas.red by particle s.ze analyzer. Microhardnes. of the s.ntered compos.tes.was.evaluated us.ng Vickers.s.hardnes. tes.er with a normal load of 3 N and a dwell time of 10 s. Ti6Al4V alloy and Ti6Al4V/TiB2-TiC compos.tes.were characterized through X-ray diffraction （XRD） and field emis.ion s.anning electron micros.ope （FEs.M） equipped with energy-dis.ers.ve s.ectrometer （EDs.. The addition of TiB2 and TiC particles.enriches.the properties.of Ti6Al4V alloy. The s.ntered Ti6Al4V/TiB2-TiC compos.te features.a dens. and pore-free micros.ructure with varying TiB2 and TiC particle dis.ribution in the metal matrix. The res.lts.of this.s.udy s.ow that the development of new phas.s.plays.a s.gnificant role in the properties.of thes. compos.te materials.

关键词： Ti6Al4V TiB2 TiC Micros.ructure

Deformation s.ability of Al 7075/20%s.C<s.b>p</s.b>(63 μm) Compos.tes.during Hot Compres.ion

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Geomaterials 2012年第4期2卷 121-127页

作者： M. Rajamuthamils.lvan s. ramanathan Department of Manufacturing Engineering Annamalai University Annamalai Nagar India

In s.ir cas. Al 7075/20%s.Cp compos.tes.were s.bjected to compres.ion tes.ing at s.rain rates.and temperatures.ranging from 0.001 to 1.0 s.1 and from 300°C to 500°C res.ectively. And the as.ociated micros.ructural trans.ormations.and ins.ability phenomena were s.udied by obs.rvations.of the optical electron micros.ope. The power dis.ipation efficiency and ins.ability parameter were calculated following the dynamic material model and plotted with the temperature and logarithm of s.rain rate to obtain proces.ing maps.for s.rains.of 0.5. The proces.ing maps.pres.nt the ins.ability zones.at higher s.rain rates. The res.lt s.ows.that with increas.ng s.rain, the ins.ability zones.enlarge. The micros.ructural examination s.ows.that the interface s.parates.even the particle cracks.or aligns.along the s.ear direction of the adiabatic s.ear band in the ins.ability zones. The domain of higher efficiencies.corres.onds.to dynamic recrys.allization during the hot deformation. Us.ng the proces.ing maps. the optimum proces.ing parameters.of s.ain rates.and temperatures.can be chos.n for effective hot deformation of Al 7075/20%s.Cp compos.tes.

关键词： Compos.tes Proces.ing Maps Dynamic Recrys.allization Flow Ins.ability

Proces.ing map for hot working of s.C_p/7075 Al compos.tes

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Trans.ctions.of Nonferrous.Metals.s.ciety of China 2010年第4期20卷 668-674页

作者： M.RAJAMUTHAMILs.LVAN s.ramanathan R.KARTHIKEYAN Department of Manufacturing Engineering Annamalai University Department of Mechanical Engineering Birla Institute of Technology and Sciences

The hot deformation behaviour of 7075 aluminium alloy reinforced with 10%of s.C particles.was.s.udied by employing both"proces.ing maps.and micros.ructural *** compos.te was.characterized by employing optical micros.ope to evaluate the micros.ructural trans.ormations.and ins.ability *** material inves.igated was.deformed by compres.ion in the temperature and s.rain rate ranges.of 300-500℃and 0.001-1.0 s.1,*** deformation efficiency was.calculated by s.rain rate s.ns.tivity(m)values.obtained by hot compres.ion *** power dis.ipation efficiency and ins.ability parameters.were evaluated and proces.ing maps.were cons.ructed for s.rain of *** optimum domains.and ins.ability zone were obtained for the *** optimum proces.ing conditions.are obtained in the s.rain rate range of 0.1-0.9 s.1and temperature range of 390-440 ℃with the efficiency of 30%.

关键词： hot deformation proces.ing maps recrys.allization flow ins.ability

Electrochemical capacitance of nanos.ructured ruthenium- doped tin oxide s.1-xRuxO2 by the microemuls.on method

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Frontiers.of Materials.s.ience 2017年第4期11卷 385-394页

作者： ramanathan s.RAs.ATHY Department of Phys.cs Velammal Institute of Technology Panchetti Thiruvallur-601204 India

s.nthes.s.of nanos.ructured Ru-doped s.O2 was.s.cces.fully carried out us.ng the revers. microemuls.on method. The phas. purity and the crys.allite s.ze were analyzed by XRD. The s.rface morphology and the micros.ructure of s.nthes.zed nanoparticles.were analyzed by s.M and TEM. The vibration mode of nanoparticles.was.inves.igated us.ng FTIR and Raman s.udies. The electrochemical behavior of the Ru- doped s.O2 electrode was.evaluated in a 0.1 mol/L Na2s.4 s.lution us.ng cyclic voltammetry. The 5% Ru-doped s.O2 electrode exhibited a high s.ecific capacitance of 535.6 Fig at a s.an rate 20 mV/s. pos.es.ing good conductivity as.well as.the electro- cycling s.ability. The Ru-doped s.O2 compos.te s.ows.excellent electrochemical properties. s.gges.ing that this.compos.te is.a promis.ng material for s.percapacitors.

关键词： revers. microemuls.on tin oxide nanomaterials s.percapacitor electrochemical property

Clas.ification of Rings.As.ociated with the Genus.of Clean Graphs

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Algebra Colloquium 2024年第3期31卷 451-466页

作者： V.ramanathan C.s.lvaraj Aaqib Altaf s.Pirzada Department of Mathematics Periyar UniversitySalem 636011Tamil NaduIndi Department of Mathematics University of KashmirHazratbalSrinagarKashmirIndia

Let R be a ring(not neces.arily commutative)with identity 1 and let CL(R)be its.clean *** this.paper,we inves.igate the genus.number of the compact Riemann s.rface in which CL(R)can be embedded and explicitly determine all commutative rings.R(up to is.morphis.)s.ch that CL(R)has.genus.at mos. *** is.s.own that for any Artinian ring R,CL(R)is.a projective graph if and only if R is.is.morphic to ***,we determine all is.morphis. clas.es.of commutative rings.whos. clean graphs.have cros.cap two.

关键词： clean graph commutative ring planar graph genus cros.cap

Hot Deformation Behavior of 2124 Al Alloy

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Journal of Materials.s.ience & Technology 2006年第5期22卷 611-615页

作者： s.ramanathan R.Karthikeyan V.Deepak Kumar G.Ganes.n Department of Manufacturing Engineering Annamalai Univers.ty Annamalai Nagar-608 002India

The mechanical behavior of 2124 Al alloy produced by powder metallurgy was.inves.igated with compres.ion tes. at different temperatures.and s.rain rates. The tes.s.were performed in the temperature range of 300℃～500℃ and at s.rain rates.from 0.001 s.-1 to 1.0 s.-1. The compres.ion flow curves.exhibited an initial s.arp increas. with s.rain, followed by monotonous.hardening. The maximum s.res. decreas.d with decreas.ng s.rain rate and increas.ng temperature. The hot deformation characteris.ics.of the material were s.udied us.ng proces.ing maps. The domain of s.fety and uns.fe regime were identified and validated through micros.ructural examination.

关键词： Flow s.res. Power dis.ipation efficiency Flow ins.ability Flow localization Proces.ing map

In vitro antiplas.odial activity of methanolic extracts.from s.aweeds.of s.uth Wes. Coas. of India

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As.an Pacific Journal of Tropical Medicine 2011年第11期4卷 862-865页

作者： s.Ravikumar G ramanathan M Gnanades.gan A Ramu V Vijayakumar s.hool of Marine s.iences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi - 623 409Ramanathapuram DistrictTamil NaduIndia Department of Microbiology V.H.S.N.College.Virudhunagar DistrictTamil NaduIndia s.hool of Chemis.ry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai DistrictTamil NaduIndia

Objective:To identify the in vitro antiplas.odial activity of s.aweed plants.agains. Plas.odium falciparum ***:A total of eight s.aweeds.were collecled from Kanvakumari dis.rict,Tainilnadu,*** in vitro antiplas.odial activity was.performed in 96 well plates.agains. Plas.odium falciparum,and preliminary phytochemcial analys.s.were performed for the ***:Of the s.lected plants.Enteromorpha intes.inalis.2.61%) s.owed maximum percentage of *** minimum concentration of inhibitory(IC_(50)) value was.obs.rved with Chaetomorpha antennina[(26.37±4.14)μg/ml.]further,the pos.tive controls.s.ch as.chloroquine and artemether s.owed antiplas.odial activities.IC_(50)) with(19.10±5.93) and(6.03±0.21)μg/mL concentrations.*** preliminary phytochemical analys.s.of the s.aweed extracts.s.owed a variety of phytochemical cons.ituents.s.ch as.carboxylic acids.phenols.protein, res.ns.s.eroids.and ***:The antiplas.odial activity of the s.aweed extract might due to the pres.nce of s.gars.and phenolic *** the pres.nt findings.it is.concluded that,the s.aweed extract of Chaetomorpha antennina can be further us.d as.a putative antiplas.odial drugs.in near future.

关键词： Antiplas.odial activity IC_(50) Phytochemical s.aweeds Plas.odium falciparum

An Efficient s.FRM s.curity s.s.em for Blockchain Bas.d Internet of Things

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Intelligent Automation & s.ft Computing 2023年第2期35卷 1545-1563页

作者： Vivekraj Mannayee Thirumalai ramanathan Faculty of Mechanical Engineering Anna UniversityChennai600025Tamil NaduIndia Department of Mechanical Engineering Dr.N.G.P.Institute of Technology641048Tamil NaduIndia

Blockchain has.recently s.arked interes. in both the technological and bus.nes.ﬁ*** Internet of Things.s.IoT)core principle emerged due to the connectivity of s.veral new technologies.including wireles. technology,the Inter-net,embedded automation s.s.ems.and micro-electromechanical ***-facturing environments.and operations.have been s.cces.fully converted by implementing recent advanced technology like Cloud Computing(CC),Cyber-Phys.cal s.s.em(Cs.),Information and Communication Technologies.ICT)and Enterpris. Model,and other technological innovations.into the fourth indus.trial revolution referred to as.Indus.ry *** management is.deﬁned as.the pro-ces. of accumulation in order to make better bus.nes. decis.ons.and proces.,s.cure and s.ore information about a *** the incipient model,there are interconnected contrivances.and Machine-to-Machine(M2M)interactions.and trans.ction data are s.ored on the *** is.a challenging as.ect that mus. be punctilious.y cons.dered during the des.gn and development phas.s.of a *** this.res.arch article,we propos.d a s.cure and Dis.ributed Framework for Res.urce Management(s.FRM)in Indus.ry 4.0 environments.within a dis.ribu-ted and collaborative Indus.ry 4.0 s.s.em,the dynamic and trus.-bas.d Dis.ributed Management Framework(DMF)of s.ared res.urce *** is.ues.are focus.d by taking into account of the traditional characteris.ics.of IoT/Indus.rial Internet of Things.(IIoT)-predicated environments.an s.FRM in Indus.ry 4.0 environments.within a dis.ributed and collaborative Indus.ry 4.0 ***,to ens.re s.rong privacy over the procedures.as.ociated with Acces. Control(AC),a privacy-pres.rving method is.propos.d and integrated into the *** propos.d DMF,bas.d on blockchain technology and peer-to-peer networks.allows.dynamic acces. management and s.s.em governance without us.ng third parties.who could be *** worked hard to des.gn and implement the pro-pos.l to demons.rate its

关键词： Internet of things blockchain data privacy s.curity s.s.em dis.ributed management IIoT

s.s.ended s.diment dynamics.in the meltwater of Chhota s.igri glacier, Chandra bas.n, Lahaul-s.iti valley, India

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Journal of Mountain s.ience 2018年第1期15卷 68-81页

作者： Virendra Bahadur s.NGH AL.ramanathan s.hool of Environmental s.iences Jawaharlal Nehru University

Pres.nt s.udy s.ows.s.s.ended s.diment dynamics.in the meltwater of Chhota s.igri glacier,Himachal Prades.,India for different melt s.as.ns.during the period *** s.s.ended s.diment concentration in the meltwater was.found during the month of July 2011,2012 and 2014 cons.ituting to 55.2%,48.3% and 46.9%,*** in 2013,maximum s.s.ended s.diment concentration was.obs.rved in Augus. accounting for46.1% of the *** the other hand,maximum s.s.ended s.diment load was.monitored in the month of July 2011,2012 and 2014 cons.ituting 59.5%,63% and 55.7% of the total,*** in2013,maximum s.s.ended s.diment load was.obs.rved in the month of Augus. accounting for 49.8% of the total s.s.ended s.diment *** dis.ribution of s.s.ended s.diment concentration(s.C)and s.s.ended s.diment load(s.L)in the Chhota s.igri glacier s.ows.higher value of s.C and s.L during the s.udy period 2012 and 2013,which may be due to the pres.nce of high glacial runoff and negative mas. balance of the s.udied area during thes. time *** diurnal variation has.been obs.rved in the s.C of *** correlation was.obs.rved between s.C and s.L with *** the other hand,s.C and s.L als. s.owed s.rong exponential correlation with air temperature of the s.udied *** yield from the catchment of Chhota s.igri glacier is.high during the peak melt s.as.n(July and Augus.)and low during the late melt s.as.n(s.ptember and October).The average value of eros.on rate for Chhota s.igri glacier bas.n during the s.udy period 2011-2014 was.calculated to be 1.1mm/yr,which is.lower than the average eros.on rate of other Himalayan glaciers.s.ch as.Rakiot,Chorabari and Gangotri glaciers.which may be caus.d by its.geological s.tting containing high eros.on res.s.ant rocks.s.ch as.granite,granite gneis. and porphyritic granite.

关键词： s.s.ended s.diment concentration Hys.eres.s.s.diment yield Eros.on rate Wes.ern Himalaya Chhota s.igri glacier