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Transactions of Nonferrous Metals society of China 2016年第6期26卷 1498-1511页

作者： J.JEBEEN MOsEs I.DINAHARAN s.joseph sekhar Department of Mechanical Engineering St.Xavier's Catholic College of Engineering Department of Mechanical Engineering science University of JohannesburgAuckland Park Kingsway Campus

stir casting was used to produce AA6061/15%TiC （mass fraction） aluminum matrix composites （AMCs）. An empirical relationship was developed to predict the effect of stir casting parameters on the ultimate tensile strength （UTs） of AA6061/TiC AMCs. A central composite rotatable design consisting of four factors and five levels was used to minimize the number of experiments, i.e., castings. The factors considered were stirring speed, stirring time, blade angle and casting temperature. The effect of those factors on the UTs of AA6061/TiC AMCs was derived using the developed empirical relationship and elucidated using microstructural characterization. Each factor significantly influenced the UTs. The variation in the UTs was attributed to porosity content, cluster formation, segregation of TiC particles at the grain boundaries and homogenous distribution in the aluminum matrix.

关键词： aluminum matrix composite stir casting TiC tensile strength

Charting the course:India's health expenditure projections for 2035

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Global Health Journal 2024年第2期8卷 58-66页

作者： Pragyan Monalisa sahoo Himanshu sekhar Rout Department of Analytical&Applied Economics Utkal UniversityBhubaneswarOdishaIndia Department of Analytical and Applied Economics&RUsA Centre of Excellence in Public Policy and Governance Utkal UniversityVani ViharBhubaneswarOdishaIndia

Objectives Understanding past trends and forecasting future changes in health spending is vital for planning and reducing reliance on out-of-pocket(OOP)*** current study analyzed health expenditure patterns in India and forecasted future trends and patterns until *** Data on health expenditure in India from 2000 to 2019 was collected from the Organisation for Economic Co-operation and Development(OECD)iLibrary and National Health Accounts 2019 *** domestic product(GDP)data from the World Bank was also *** statistics analyzed the composition and pattern,while the exponential smoothing model forecasted future health *** The findings revealed that expenditure made by OOP is the primary health financing source,followed by government and pre-paid private *** percentage of GDP allocated to total health expenditure remains stable,while the per capita health expenditure *** in expenditure among states are observed,with Karnataka relying heavily on pre-paid private *** projections suggest a decline in per capita and total health expenditure as a share of GDP,with a slight increase in the government’s ***-paid private expenditure per capita and OOP health expenditure as a share of the total is projected to remain relatively constant but still high in absolute *** The study highlights variations in health spending in India,characterized by high OOP spending,limited public coverage,and a need for investments,and reforms to improve healthcare access and equity.

关键词： Health expenditure Health spending Health financing Forecasting Exponential smoothing India

Eigen value analysis of composite hollow shafts using modified EMBT formulation considering the shear deformation along the thickness direction

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Defence Technology（防务技术） 2023年第10期28卷 1-12页

作者： Pavani Udatha A.s.sekhar Velmurugan R Machine Design section Department of Mechanical EngineeringIIT MadrasChennai600036India Department of Aerospace Engineering IIT MadrasChennai600036India

Composite hollow shafts are used in power transmission applications due to their high specific stiffness and high specific *** dynamic characteristics of these shafts are important for transmission *** modelling of these shafts is generally carried out using Equivalent Modulus Beam Theory(EMBT)and Layerwise Beam Theory(LBT)*** EMBT formulation is modified by considering stacking sequence,shear normal coupling,bending twisting coupling and bending stretching *** is observed that modified EMBT formulation is underestimating the shafts stiffness at lower length/mean diameter(l/dm)*** the present work,a new formulation is developed by adding shear deformation along the thickness direction to the existing modified EMBT *** variation of shear deformation along the thickness direction is found using different shear deformation theories,i.e.,first-order shear deformation theory(FsDBT),parabolic shear deformation theory(PsDBT),trigonometric shear deformation theory(TsDBT),and hyperbolic shear deformation theory(HsDBT).The analysis is performed at l/d_(m) ratios of 5,10,15,20,25,30,35,and 40 for carbon/epoxy composites,E-glass/epoxy composites,and boron/epoxy composite *** results show that new formulation has improved the bending natural frequency of the composite shafts for l/d_(m)son with modified *** effect of new formulation is more significant for the second and third bending modes of natural frequencies.

关键词： Composite hollow shafts Bending natural frequency Modified EMBT formulation Thickness effect

Resource scheduling approach in cloud Testing as a service using deep reinforcement learning algorithms

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CAAI Transactions on Intelligence Technology 2021年第2期6卷 147-154页

作者： Priyadarsini Karthik Karthik sekhar Department of Computer science and Engineering Vels Institute of Science Technology and Advanced Studies(VISTAS)ChennaiIndia Department of Electronics and Communication Engineering College of Engineering and TechnologySRM Institute of Science and TechnologyVadapalani CampusChennaiIndia

Many organizations around the world use cloud computing Testing as service(Taas)for their *** computing is principally based on the idea of on-demand delivery of computation,storage,applications,and additional *** depends on delivering user services through Internet *** addition,it uses a pay-as-you-go business design to deliver user *** offers some essential characteristics including on-demand service,resource pooling,rapid elasticity,virtualization,and measured *** are various types of virtualization,such as full virtualization,para-virtualization,emulation,〇s virtualization,and application *** scheduling in Taas is among the most challenging jobs in resource allocation to mandatory tasks/jobs based on the required quality of applications and *** of the cloud environment,uncertainty,and perhaps heterogeneity,resource allocation cannot be addressed with prevailing *** situation remains a significant concern for the majority of cloud providers,as they face challenges in selecting the correct resource scheduling algorithm for a particular *** authors use the emergent artificial intelligence algorithms deep RM2,deep reinforcement learning,and deep reinforcement learning for Taas cloud scheduling to resolve the issue of resource scheduling in cloud Taas.

关键词： service cloud prevailing

New Preamble sequence for WiMAX system with Improved synchronization Accuracy

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Intelligent Automation & soft Computing 2023年第3期35卷 3187-3197页

作者： suma sekhar sakuntala s.Pillai s.santhosh Kumar Department of Electronics and Communication Engineering LBS Institute of Technology for WomenThiruvananthapuramKeralaIndia Mar Baselios College of Engineering and Technology ThiruvananthapuramKeralaIndia Department of Electronics and Communication Govt.Engineering CollegeIdukkiKeralaIndia

Worldwide Interoperability for Microwave Access(WiMAX)trusts Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM)combination for the deployment of physical layer functions and for connecting the medium access control to the wireless *** though Orthogonal Frequency Division Multiplexing(OFDM)facilitates reliable digital broadband transmission in the fading wireless channels,the presence of synchro-nization errors in the form of Carrier Frequency Offset(CFO)and Time Offset(TO)adversely affect the performance of OFDM based physical *** objective of this work is to improve the accuracy of the frequency and the time offset estimation in the WiMAX physical layer.A method to enhance the synchro-nization accuracy byﬁne-tuning the merit factor of the preamble sequence is sug-gested in this ***,a new preamble with improved synchronization accuracy is proposed for the WiMAX *** performance of the proposed preamble is evaluated in a Rayleigh fading channel and the results of simulations show that the Mean square Error(MsE)in offset estimation is signiﬁcantly reduced and it outperforms the standard WiMAX preamble.

关键词： WiMAX MIMO OFDM time offset carrier frequency offset preamble sequence integrated sidelobe level merit factor

In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of Magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： Manchi Nagaraju s.Chandra sekhar Bhimanaboina Ramulu shaik Junied Arbaz Jae su Yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoseO3-Mg se O4,CMs) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32Mg0.68O4,CMO) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CMO samples at different growth times by keeping the temperature *** CMO electrode designed for 8 h of growth time (CMO-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CMO electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CMO-8 h sample to form the CMs *** 3 m A cm-2,the resulted CMs exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CMO-8 h ***,an asymmetric cell fabricated with CMs as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32Mg0.68O4 CoseO3–MgseO4 In situ formation Energy storage Asymmetric cell

Medicago truncatula resources to study legume biology and symbiotic nitrogen fixation

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Fundamental Research 2023年第2期3卷 219-224页

作者： Raja sekhar Nandety Jiangqi Wen Kirankumar s.Mysore Institute for Agricultural Biosciences Oklahoma State University3210 Sam Noble ParkwayArdmoreOK 73401United States UsDA-ARs Cereal Crops Research UnitEdward T.Schafer Agricultural Research CenterFargoND 58102United States Department of Biochemistry and Molecular Biology Oklahoma State UniversityStillwaterOK 74078United States

Medicago truncatula is a chosen model for legumes towards deciphering fundamental legume biology,especially symbiotic nitrogen *** genomic resources for *** include a completed whole genome sequence information for R108 and Jemalong A17 accessions along with the sparse draft genome sequences for other 226 *** *** genomic resources are complemented by the availability of mutant resources such as retrotransposon(Tnt1)insertion mutants in R108 and fast neutron bombardment(FNB)mutants in *** addition,several *** databases such as small secreted peptides(ssPs)database,transporter protein database,gene expression atlas,proteomic atlas,and metabolite atlas are available to the research *** review describes these resources and provide information regarding how to access these resources.

关键词： Medicago truncatula Model legume Medicago resources Tnt1 Mutagenesis Medicago gene atlas

A comparative analysis of unsteady and steady Buongiorno’s Williamson nanoliquid flow over a wedge with slip effects

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1767-1777页

作者： R.Chandra sekhar Reddy P.sudarsana Reddy Department of Mathematics Rajeev Gandhi Memorial Collge of Engineering&TechnologyNandyalA.P.India

Comparison between unsteady and steady MHD Buongiorno’s model Williamson nanoliquid flow through a wedge with slip effects,chemical reaction and radiation is made in this *** and Brownian motion are also considered in this *** similarity variables are presented to transmute the governing PDEs into the set of non-linear *** most widely authenticated finite element method is implemented to analyze these set of ODEs *** behavior of concentration,temperature and velocity sketches for varied values of relevant parameters is numerically calculated and the outcomes are plotted through *** numerical values of dimensionless rates of mass transfer,heat and velocity are also evaluated and depicted through *** is noted that with upsurging values of angle of wedge parameter,the distributions of temperature of the liquid intensify in both steady and unsteady cases.

关键词： Finite element method Chemical reaction Williamson nanoliquid Thermophoresis Thermal radiation Brownian motion

Higher-Order Compact scheme for the Incompressible Navier-stokes Equations in spherical Geometry

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Communications in Computational Physics 2012年第1期11卷 99-113页

作者： T.V.s.sekhar B.Hema sundar Raju Y.V.s.s.sanyasiraju Department of Mathematics Pondicherry Engineering CollegePuducherry-605014India Department of Mathematics Indian Institute of TechnologyMadrasChennai-600036India

A higher-order compact scheme on the nine point 2-D stencil is developed for the steady stream-function vorticity form of the incompressible Navier-stokes(Ns)equations in spherical polar coordinates,which was used earlier only for the cartesian and cylindrical *** steady,incompressible,viscous and axially symmetric flow past a sphere is used as a model *** non-linearity in the N-s equations is handled in a comprehensive manner avoiding complications in *** scheme is combined with the multigrid method to enhance the convergence *** solutions are obtained over a non-uniform grid generated using the transformation r=ex while maintaining a uniform grid in the computational *** superiority of the higher order compact scheme is clearly illustrated in comparison with upwind scheme and defect correction technique at high Reynolds numbers by taking a large *** is a pioneering effort,because for the first time,the fourth order accurate solutions for the problem of viscous flow past a sphere are presented *** drag coefficient and surface pressures are calculated and compared with available experimental and theoretical *** is observed that these values simulated over coarser grids using the present scheme aremore accuratewhen compared to other conventional *** has also been observed that the flow separation initially occurred at Re=21.

关键词： Fourth order compact scheme Navier-stokes equations spherical polar coordinates drag coefficient.

Observation of free oscillations after the 2010 Chile and 2011 Japan earthquakes by superconducting gravimeter in Kutch,Gujarat,India

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Geodesy and Geodynamics 2023年第1期14卷 52-64页

作者： Chandra sekhar Pedapudi Madhusudhana Rao Katlamudi severine Rosat Institute of seismological Research GandhinagarGujaratIndia Department of Earth sciences Gujarat UniversityAhmedabadGujaratIndia Institut Terre et Environnement de strasbourg CNRS UMR 7063StrasbourgFrance

In this paper,we present observations of free oscillations of the Earth after major earthquakes in Chile(February 27,2010,Mw8.8)and Japan(March 11,2011,Mw9.1)using data from the dual-sphere superconducting gravimeter(sG-055),installed at Badargadh(23°0.47 N,70°0.62 E),Kutch,Gujarat,India in March *** see the noise characteristics,we calculated the power spectral density of the gravity time series of 5 quiet days in the frequency band 0.05-20 mHz using the new low noise model(NLNM)as a *** compared the noise level of the Badargadh site to other sG sites around the *** shows that the Badargadh sG is in a low noise *** find that the noise increases at frequencies below 1 *** a characteristic is also observed in Djougou(Afrique,Benin)and strasbourg(France).Using theoretical tides for Gujarat,we estimated a scale factor of about-814 nm/s~2/V for Gravl(lowersphere)and about-775 nm/s~2/V for Grav2(upper-sphere).We corrected the influence of atmospheric pressure from the one-second gravity data before switching to the frequency *** extracted a total of 53 Earth’s Free Oscillations(EFO)modes during the earthquake in Japan and about 47 EFO modes during the earthquake in *** are able to extract the lowest0s2spheroidal mode(0.30945 mHz or54 min)and0s0radial mode(0.81439 mHz or 20 min).The longer time series shows individual0s2singlets and0s3(0.46855 mHz)singlets due to the Coriolis splitting *** cross-referenced the frequencies of these modes using the PREM model and previous global *** correlation coefficient between the observed and the PREM model for these two events are 0.999 for Japan earthquake and 0.993 for Chile *** validates the quality of the data useful for low-frequency studies in *** also calculated the relative deviations of our observed fundamental modes with previously determined observed and theoretical *** found that the relative deviations of our observed free oscillations

关键词： superconducting gravity data Free oscillations PREM model