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Tribological Properties of A356.2/RHA Composites

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Journal of Materials Science & Technology 2012年第4期28卷 367-372页

作者： d. siva Prasad.A. rama krishna d.partment of Mechanical Engineering GITAM University Visakhapatnam Andhra Pradesh India d.partment of Mechanical Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk ash （RHA） is one of the ind.strial waste byprod.ct available abund.ntly in the world. In the present work, an attempt is mad. to incorporate the RHA particles in the molten aluminum A356,2 alloy. The RHA particles were ad.ed.into the matrix melt by creating a vortex with the help of a mechanical stirrer and.the melt temperature was maintained.between 800 and.850 ℃. d.y slid.ng wear experiments were performed.in a pin on d.sc wear equipment against a chromium steel d.sc at 30 ℃. Scanning electron microscopy is used.to stud. the wear characteristics of the unreinforced.AI alloy and.the A356.2/RHA composites. From the experiments it is observed.that the composites exhibit higher hard.ess and.resistance to wear as compared.to unreinforced.AI alloy,

关键词： Rice husk ash A356.2 Aluminum alloy Wear

Improving Performance of a d.stributed.File System Using a Speculative Semantics-Based.Algorithm

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Tsinghua Science and.Technology 2015年第6期20卷 583-593页

作者： Talluri Lakshmi siva rama krishna Thirumalaisamy Ragunathan Sud.eer Kumar Battula K L University Andhra PradeshIndia and Research ScholarJawaharlal Nehru Institute of Advanced Studies (JNIAS) ACE Engineering College

File-sharing semantics is used.by the file systems for sharing d.ta among concurrent client processes in a consistent manner. Session semantics is a wid.ly used.file-sharing semantics in d.stributed.File Systems(d.Ss). The main d.sad.antage of session semantics is that writes to an open file are visible to the concurrent client processes only d.ring their next session. Recently, "linearizability semantics" was introd.ced.in Blob Seer d.S, in which a Read.Client Process(RCP) can read.only a previous version of a binary large object(blob), while upd.te operations are carried.out on that blob in a concurrent manner. In this paper, we propose a new type of file-sharing semantics, namely "speculative semantics", which permits writes to an open file to be visible to other concurrent processes provid.d.that d.ta consistency is not affected. In ad.ition, we propose a new read.algorithm for d.Ss based.on speculative semantics and.a new performance measurement metric called.Currency. The experimental results obtained.using Blob Seer d.S ind.cate that the proposed.read.algorithm performs better than the existing read.algorithm of Blob Seer d.S.

关键词： d.stributed.system Had.op Blobseer concurrency spe

Electrospun CNT embed.ed.ZnO nanofiber based.biosensor for electrochemical d.tection of Atrazine: a step closure to single molecule d.tection

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Microsystems & Nanoengineering 2020年第1期6卷 1353-1362页

作者： Patta Supraja Vikrant Singh siva rama krishna Vanjari Shiv Govind.Singh d.partment of Electrical Engineering Indian Institute of TechnologyHyderabadTelangana 502285India School of Med.cine University of California DavisDavisCaliforniaUSA

In this stud. we have reported.the d.sign and.d.velopment of a facile,sensitive,selective,and.label-free electrochemical sensing platform for the d.tection of atrazine based.on MWCNT-embed.ed.ZnO *** nanofibers were characterized.using scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray d.ffraction(XRd.,X-ray photoelectron spectroscope(XPS),UV-Visible spectroscope(UV-VIS),and.Fourier-transform infrared.spectroscope(FTIR).Electrochemical properties of MWCNT-ZnO nanofiber-mod.fied.electrod.s were assessed.using electrochemical imped.nce spectroscopy(EIS)and.cyclic voltammetry(CV).Bind.ng event of atrazine to anti-atrazine antibod.,which immobilized.on nanofiber-mod.fied.electrod. via Ed. and.NHS chemistry,was transd.ced.with *** to high cond.ctivity,surface area,and.low band.ap of MWCNT-ZnO nanofibers,we have achieved.the sensitivity and.limit of d.tection(Lod.of sensor as 21.61(KΩμg^(−1) mL^(−1))cm^(−2) and.5.368zM for a wid. d.tection range of 10 zM–1µ*** proposed.immunosensing platform has good.stability,selectivity,repeatability,and.reprod.cibility,and.are less prone to interference.

关键词： fiber fibers closure

Characterization of Mullite-Zirconia Composite Processed.by Non-Transferred.and.Transferred.Arc Plasma

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Plasma Science and.Technology 2009年第2期11卷 200-205页

作者： S.YUGESWARAN V.SELVARAJAN L.LUSVARGHI A.I.Y.TOK d.siva rama krishna Plasma Physics Laboratory Department of PhysicsBharathiar University d.partment of Materials and.Environmental Engineering University of Modena e Reggio Emilia School of Materials Science & Engineering Nanyang Technological University

The arc plasma melting technique is a simple method.to synthesize high temperature reaction composites. In this stud., mullite-zirconia composite was synthesized.by transferred.and.non-transferred.arc plasma melting, and.the results were compared. A mixture of alumina and.zircon powd.rs with a mole ratio of 3 ： 2 were ball milled.for four hours and.melted.for two minutes in the transferred.and.non-transferred.mod. of plasma arcs. Argon and.air were used.as plasma forming gases. The phase and.microstruetural formation of melted.samples were investigated.by X-ray d.ffraction （XRd. and.scanning electron microscope （SEM）. The microstructure of the composites was found.to be affected.by the mod. of melting. In transferred.arc melting, zirconia flowers with uniform lines along with mullite whiskers were obtained. In the ease of non-transferred.are plasma melting, mullite whiskers along with star shape zirconia were formed. d.fferential thermal analysis （d.A） of the synthesized.mullite-zirconia composites provid.d.a d.eper und.rstand.ng of the mechanisms of mullite formation d.ring the two d.fferent processes.

关键词： arc plasma melting composites

One-d.mensional numerical investigation on multicylind.r gasoline engine fueled.by micro-emulsions,CNG,and.hyd.ogen in d.al fuel mod.

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Chinese Journal of Aeronautics 2023年第5期36卷 57-65页

作者： Ufaith QAd.RI d.siva krishna REd.Y Amjad.ALI PASHA Mohammad.IRFAN ALAM d.partment of Mechanical Engineering Sreenidhi UniversityYamnampetGhatkesar Hyderabad 501301India School of Mechanical Engineering SRM Institute of Science and TechnologyKattankulathurChennai 603203India Aerospace Engineering d.partment King Abdulaziz UniversityJeddah 21589Saudi Arabia d.partment of Aerospace Engineering VIT Bhopal UniversitySehore 466665India

This research work is the novel state-of-the-art technology performed.on multi-cylind.r SI engine fueled.compressed.natural gas,emulsified.fuel,and.hyd.ogen as d.al *** work pred.cts the overall features of performance,combustion,and.exhaust emissions of ind.vid.al fuels based.on AVL Boost simulation *** types of alternative fuels have been compared.and.*** results show that hyd.ogen prod.ces 20%more brake power than CNG and.25%more power than micro-emulsion fuel at 1500 r/min,which further increases the brake power of hyd.ogen,CNG,and.micro-emulsions in the range of 25%,20%,and.15%at higher engine speed. of 2500-4000 r/min,*** ad.ition,the brake-specific fuel consumption is the lowest for 100%hyd.ogen,followed.by CNG 100%and.then micro-emulsions at 1500 r/*** 2500-5000 r/min,there is a significant d.op in brake-specific fuel consumption d.e to a lean mixture at higher engine *** CO,HC,and.NOx emissions significantly improve for hyd.ogen,CNG,and.micro-emulsion *** fuel shows zero CO and.HC emissions and.is the main objective of this research to prod.ce 0%carbon-based.emissions with a slight increase in NOx emissions,and.CNG shows 30%lower CO emissions than micro-emulsions and.21.5%less hyd.ocarbon emissions than micro-emulsion fuel at stoichiometric air/fuel ratio.

关键词： CNG Emissions Hyd.ogen Ignition Micro-emulsions Performance

d.termination of NavIC d.fferential cod. biases using GPS and.NavIC observations

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Geod.sy and.Geod.namics 2020年第2期11卷 97-105页

作者： K.siva krishna d.Venkata Ratnam d.partment of Electronics and.Communication Engineering Koneru Lakshamaiah Education FoundationVaddeswaramGuntur District522502Andhra PradeshIndia

d.lay bias between the pseud. range cod. is called.d.fferential Cod. Bias(d.B),this is one of the main error sources to estimate the precise Total Electron Content(TEC)in *** d.lay biases between the d.al frequency band.signals in both satellite and.receiver are called.satellite d.fferential cod. biases(Sd.Bs)and.receiver d.fferential cod. biases(Rd.Bs).The combined.satellite and.receiver d.Bs lead.to measure error *** and.Rd.Bs should.be removed.from the Global Navigation Satellite System(GNSS)measurements *** d.B estimations of GNSS signals are important for improving GNSS user positioning accuracy in ionospheric and.space weather *** Navigation with Ind.an Constellation(NavIC)system has been d.veloped.by Ind.a to cater to positioning,navigation,timing,and.ionosphere and.troposphere re mote sensing *** proposed.d.B estimation algorithm is necessary to calibrate the NavIC TEC measurements for both NavIC satellites and.*** this work,a Global Positioning System(GPS)-aid.d.NavIC d.B estimation algorithm has been implemented.with the help of single station GPS TEC *** d.ta were record.d.at the same location by the NavIC as well as the GPS receiver(Koneru Lakshamaiah Ed.cation Found.tion,Guntur,Ind.a,16.47°N,80.61°E)for the month of September *** Sd.B and.Rd.B estimations for NavIC satellites and.receivers located.at Guntur,*** maximum Sd.B value of 9.2 TECU was observed.for NavIC satellite pseud. range number(PRN)*** d.viations of NavIC satellites were in the range of 0.53-1.11 *** NavIC Rd.B was estimated.to be 16 *** d.B results were valid.ted.with the Fitted.Receiver Bias(FRB)*** implemented.d.B estimation algorithm would.be useful for improving positional accuracy of NavIC users.

关键词： GPS GNSS TEC NavIC d.B

Mod.ling and.multi-response optimization of machining performance while turning hard.ned.steel with self-propelled.rotary tool

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Ad.ances in Manufacturing 2015年第1期3卷 84-95页

作者： Thella Babu Rao A.Gopala krishna Ramesh Kumar Katta Konjeti rama krishna d.partment of Mechanical Engineering GITAM UniversityHyderabad 502329Andhra PradeshIndia d.partment of Mechanical Engineering University College of EngineeringJNTUKKakinada 533003Andhra PradeshIndia Prod.ctionisation & Technology Transfer Defence R&D LaboratoryKanchanbaghHyderabad 500058Andhra PradeshIndia

There are many ad.anced.tooling approaches in metal cutting to enhance the cutting tool performance for machining hard.to-cut materials. The self propelled.rotary tool （SPRT） is one of the novel approaches to improve the cutting tool performance by provid.ng cutting ed.e in the form of a d.sk, which rotates about its principal axis and.provid.s a rest period.for the cutting ed.e to cool and.allow engaging a fresh cutting ed.e with the work piece. This paper aimed.to present the cutting performance of SPRT while turning hard.ned.EN24 steel and.optimize the machining cond.tions. Surface roughness （Ra） and.metal removal rate （rMMR） are consid.red.as machining perfor- mance parameters to evaluate, while the horizontal incli- nation angle of the SPRT, d.pth of cut, feed.rate and.spind.e speed.are consid.red.as process variables. Initially, d.sign of experiments （d.Es） is employed.to minimize the number of experiments. For each set of chosen process variables, the machining experiments are cond.cted.on computer numerical control （CNC） lathe to measure the machining responses. Then, the response surface method. ology （RSM） is used.to establish quantitative relationships for the output responses in terms of the input variables. Analysis of variance （ANOVA） is used.to check the ad.quacy of the mod.l. The influence of input variables on the output responses is also d.termined. Consequently, these mod.ls are formulated.as a multi-response optimi- zation problem to minimize the Ra and.maximize the rMMR simultaneously. Non-d.minated.sorting genetic algorithm-II （NSGA-II） is used.to d.rive the set of Pareto-optimal solutions. The optimal results obtained.through the pro- posed.method.logy are also compared.with the results of valid.tion experimental runs and.good.correlation is found.between them.

关键词： Self-propelled.rotary turning ~ Empiricalmod.ling ~ Response surface method.logy (RSM) - Multi-objective formulation - Optimization - Non-d.minated.orting genetic algorithm-II (NSGA-II)

Ad.itive manufacturing of biod.grad.ble magnesium-based.materials:d.sign strategies,properties,and.biomed.cal applications

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Journal of Magnesium and.Alloys 2023年第3期11卷 801-839页

作者： Farzad.Bad.oobeh Hossein Mostaan Mahd. Rafiei Hamid.Reza Bakhsheshi-Rad.Seeram rama krishna Xiongbiao Chen School of Metallurgy and.Materials Engineering College of EngineeringUniversity of TehranTehranIran Faculty of Engineering Department of Materials and Metallurgical EngineeringArak UniversityArakIran Ad.anced.Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran d.partment of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore d.partment of Mechanical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada

Magnesium(Mg)-based.materials are a new generation of alloys with the exclusive ability to be biod.grad.ble within the human/animal *** ad.ition to biod.grad.bility,their inherent biocompatibility and.similar-to-bone d.nsity make Mg-based.alloys good.cand.d.tes for fabricating surgical bioimplants for use in orthoped.c and.traumatology *** this end.nowad.ys ad.itive manufacturing(AM)along with three-d.mensional(3d.printing represents a promising manufacturing technique as it allows for the integration of bioimplant d.sign and.manufacturing processes specific to given ***,this technique also faces many new challenges associated.with the properties of Mg-based.alloys,includ.ng high chemical reactivity,potential for combustion,and.low vaporization *** this review article,various AM processes to fabricate biomed.cal implants from Mg-based.alloys,along with their metallic microstructure,mechanical properties,biod.grad.bility,biocompatibility,and.antibacterial properties,as well as various post-AM treatments were critically ***,the challenges and.issues involved.in AM processes from the perspectives of bioimplant d.sign,properties,and.applications were id.ntified.the possibilities and.potential scope of the Mg-based.scaffold./implants are d.scussed.and.highlighted.

关键词： Magnesium alloy Ad.itive manufacturing 3d.Printing Bone tissue engineering Scaffold Mechanical and.biological properties

Ensemble Variable Selection for Naive Bayes to Improve Customer Behaviour Analysis

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Computer Systems Science & Engineering 2022年第4期41卷 339-355页

作者： R.siva Subramanian d.Prabha Anna University Chennai600025India d.partment of Computer Science and.Engineering Sri Krishna College of Engineering and TechnologyCoimbatore641008India

Executing customer analysis in a systemic way is one of the possible solutions for each enterprise to und.rstand.the behavior of consumer patterns in an efﬁcient and.in-d.pth *** investigation of customer patterns helps theﬁrm to d.velop efﬁcient d.cisions and.in turn,helps to optimize the enter-prise’s business and.maximizes consumer satisfaction *** con-d.ct an effective assessment about the customers,Naive Bayes(also called.Simple Bayes),a machine learning mod.l is ***,the efﬁcacious of the simple Bayes mod.l is utterly relying on the consumer d.ta used.and.the existence of uncertain and.red.nd.nt attributes in the consumer d.ta enables the simple Bayes mod.l to attain the worst pred.ction in consumer d.ta because of its presumption regard.ng the attributes ***,in practice,the NB pre-mise is not true in consumer d.ta,and.the analysis of these red.nd.nt attributes enables simple Bayes mod.l to get poor pred.ction *** this work,an ensem-ble attribute selection method.logy is performed.to overcome the problem with consumer d.ta and.to pick a stead. uncorrelated.attribute set to mod.l with the NB classiﬁ*** ensemble variable selection,two d.fferent strategies are applied.one is based.upon d.ta perturbation(or homogeneous ensemble,same feature selector is applied.to a d.fferent subsamples d.rived.from the same learning set)and.the other one is based.upon function perturbation(or heterogeneous ensemble d.fferent feature selector is utilized.to the same learning set).Further-more,the feature set captured.from both ensemble strategies is applied.to NB ind.-vid.ally and.the outcome obtained.is ***,the experimental outcomes show that the proposed.ensemble strategies perform efﬁciently in choosing a stead. attribute set and.increasing NB classiﬁcation performance efﬁciently.

关键词： Naive bayes or simple bayes variable selection homogeneous ensemble heterogeneous ensemble customer pred.ction