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- 저자 : K. Natarajan (검색결과 16 건)
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S. K. Dasari,S. Ganguly,A. Abutunis,K. Chandrashekhara,M. F. Buchely,S. N. Lekakh,R. J. O’Malley,T. Natarajan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
Microstructural changes and softening due to static recrystallization have a critical influence on thermo-mechanical behaviorof high strength steels during industrial multi-pass hot rolling. Numerical simulation using finite element analysis (FEA)can be used to accurately predict the softening behavior during the hot rolling process. Therefore, the implementation of anexperimentally defined static recrystallization model into FEA is necessary to get realistic simulation prediction. In this study,the extent of softening during static recrystallization in Si and Mn alloyed high strength steel was measured using doublehit tests. A Gleeble™ thermo-mechanical simulator was used to perform the double hit tests with variations in temperature,strain rate, and interpass time. The kinetics of static recrystallization was developed based on the experimental results andimplemented into a finite element model of a multi-pass plate hot rolling process using explicit subroutines. Three differentmodeling approaches were implemented in Abaqus to predict the fraction of static recrystallization and softening duringmulti-pass hot rolling. Simulation results showed that the fraction of recrystallization significantly depends on the extent ofthickness reduction during rolling at a typical industrial multi-pass schedule. Additionally, an increase in temperature greatlyincreased the fraction of recrystallization and static softening. The suggested approach could be used for the optimizationof the hot rolling process for Si and Mn alloyed high strength steels.
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Synthesis and Implementation of a Multi-Port DC/DC Converter for Hybrid Electric Vehicles
T. K. Santhosh,K. Natarajan,C. Govindaraju 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5
A non-isolated Multiple Input Converter (MIC) with an input port, two storage ports and a load port is proposed. The synthesis of the proposed four port converter with its switch realization is presented. A steady state analysis of each operating mode with a small-signal model is derived, and a stability analysis is done. A mode selection controller is proposed to automatically choose a specific operating mode based on the voltage levels of the different source and storage units. In addition, a voltage control loop is used to regulate the output voltage. A 200W prototype is built with a TMS320F28027 DSP controller to test the feasibility of the operating modes. Simulation and experimental results show the ability of the proposed converter to handle multiple inputs either individually or simultaneously.
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Dynamic Relationship between Stock Index and Asset Prices: A Long-run Analysis
Vinodh K NATARAJAN,Muhammad ABRAR UL HAQ,Farheen AKRAM,Jayendira P SANKAR 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.4
There are many asset prices which are interlinked and have a bearing on the stock market index. Studies have shown that the interrelationship among these asset prices vary and are inconsistent. The ultimate aim of this study is to examine the dynamic relationship between gold price, oil price, exchange rate and stock index. Monthly time series data has been utilized by the researcher to examine the interrelationship between four variables. The relationship among stock exchange rate index, oil price and gold price have been undertaken using regression and granger causality test. The results indicate that the exchange rate and oil price have an indirect influence on NIFTY; whereas gold price had a direct impact on NIFTY. It is evident from the results that volatility in the price of gold is mainly dependent on the exchange rate and vice versa. All the variables affect NIFTY in some way or the other. However, gold has a direct and vital relationship. From the study findings, it can be concluded that macroeconomic variables like commodity prices and foreign exchange rate, gold and oil, have a strong relationship on the return on securities at the national stock exchange of India.
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Synthesis and Implementation of a Multi-Port DC/DC Converter for Hybrid Electric Vehicles
Santhosh, T. K.,Natarajan, K.,Govindaraju, C. The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5
A non-isolated Multiple Input Converter (MIC) with an input port, two storage ports and a load port is proposed. The synthesis of the proposed four port converter with its switch realization is presented. A steady state analysis of each operating mode with a small-signal model is derived, and a stability analysis is done. A mode selection controller is proposed to automatically choose a specific operating mode based on the voltage levels of the different source and storage units. In addition, a voltage control loop is used to regulate the output voltage. A 200W prototype is built with a TMS320F28027 DSP controller to test the feasibility of the operating modes. Simulation and experimental results show the ability of the proposed converter to handle multiple inputs either individually or simultaneously.
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Retardation of Grain Growth in Al 3003 Nanocomposite Weldment Using ARB Filler Metal
K. R. Ramkumar,S. Natarajan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
This research demonstrates the feasibility of fller rod fabrication to develop nanocomposite weldment to enhance the jointstrength via ARB technique. Al 3003 alloys were joined through GTAW by melting fabricated nanocomposite fller metal. TiO2 nanoparticles were chosen as reinforcement from 0 to 3 wt%. Roll bonding is desired owing to the proper distributionof TiO2 particles. SEM depicted the distribution of reinforcement particles in the grain boundaries. TEM disclosed theuniformity in particulates distribution, peening of dislocation and strain felds in 12 wt% TiO2 reinforced nanocompositeweldment. EBSD portrayed the grain refnement occurred in the weld zone due to reinforcement addition. The improvementin impact and bending strength were due to excellent bonding between the Al and reinforcement particles and excellent loadtransfer ability provided by reinforcement particles.
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Medium constituents mediated engineering for size and shape tuning of gold nanocrystallites
Anil K. Suresh,Veena Vijay,Bahrudeen S. Hameed,Sureshkumar Ramasamy,Natarajan Sakthivel 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
The current investigation introduces the utilization of cell culture mediums as a novel source for the oneplotsynthesis as well as stabilization of metal nanoparticles. By varying the medium constituents wecould control the size and shape distributions of the gold nanoparticles. Nanospheres of diameter24 6 nm and 19 5 nm were produced using DMEM and M199 mediums respectively, nanoneedles of150 50 nm using RPMI medium and nanoflowers of 60 25 nm using IMDM medium, with an overallyield of 91 2%. A remarkable decrease in the reaction duration (<3 min) was noted, irrespective of thegrowth mediums used. Fourier transform infrared spectroscopy and zeta potential measurementsrevealed them to have a common protenacious encapping agent with different overall surface charges of23 3,211,24 2, and20 1 mV for Au@DMEM, Au@RPMI, Au@IMDM andAu@M199 respectively. X-ray diffraction confirmed the purity and crystallinity of the particles withBragg peaks at (111), (200), (220) and (311) for gold nanocrystals. This approach could lead to the creativeutilization of novel eco-friendly sources for the production and size/shape control of nanoparticles. Moreover, the adopted methodology is absolutely green, robust and facile, offering new insights forsustainable synthesis for various biomedical and engineering applications.
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Jo, W.K.,Natarajan, T.S. Academic Press 2016 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.482 No.-
Novel ZnIn<SUB>2</SUB>S<SUB>4</SUB>-g-C<SUB>3</SUB>N<SUB>4</SUB>/BiVO<SUB>4</SUB> nanorod-based ternary nanocomposite photocatalysts with enhanced visible light absorption were synthesized and systematically characterized to confirm the formation of ZnIn<SUB>2</SUB>S<SUB>4</SUB> marigold flowers, the layered structure of the g-C<SUB>3</SUB>N<SUB>4</SUB>, BiVO<SUB>4</SUB> nanorods, and the formation of binary and ternary nanocomposites. The visible light absorption of BiVO<SUB>4</SUB> was significantly improved after coupling with g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnIn<SUB>2</SUB>S<SUB>4</SUB>, which was confirmed by UV-visible diffuse reflectance spectroscopic analysis. Ternary ZnIn<SUB>2</SUB>S<SUB>4</SUB>-g-C<SUB>3</SUB>N<SUB>4</SUB>/BiVO<SUB>4</SUB> nanocomposites exhibited excellent visible light photocatalytic decomposition efficiency (VL-PDE) when used for the degradation of congo red (CR) dye and metronidazole (MTZ) pharmaceutical, as well as excellent stability and reusability. The ternary 5%ZnIn<SUB>2</SUB>S<SUB>4</SUB>-50%-g-C<SUB>3</SUB>N<SUB>4</SUB>/BiVO<SUB>4</SUB> nanocomposite showed higher VL-PDE for CR (81.5%) and MTZ (59%) degradation than the binary composites, g-C<SUB>3</SUB>N<SUB>4</SUB> and BiVO<SUB>4</SUB>. Radical quenching experiments showed that h<SUP>+</SUP>, <SUP>?</SUP>OH, and O<SUB>2</SUB><SUP>?-</SUP> were the reactive radicals, validating that the Z-scheme charge carrier transfer mechanism was responsible for the enhanced VL-PDE of the ternary ZnIn<SUB>2</SUB>S<SUB>4</SUB>-g-C<SUB>3</SUB>N<SUB>4</SUB>/BiVO<SUB>4</SUB> nanocomposites, which was further confirmed by photoluminescence analysis. Furthermore, kinetic studies showed that the degradation followed pseudo-first-order kinetics, and that the ternary photocatalysts could be reused up to three times with good stability. The enhanced visible light absorption, high surface area, high adsorption capacity, Z-scheme charge carrier transfer, and increased lifetime of photo-produced electron-hole pairs were responsible for the increased visible light photocatalytic decomposition efficiency.
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N. J. Suthan Kissinger,NATARAJAN VELMURUGAN,K. Perumal 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.4
Zinc-Selenide (ZnSe) thin films were prepared by using physical vapor deposition under a vacuum of 5 × 10−6 Torr by using an electron beam evaporated technique at different substrate temperatures, RT, 100, 200, and 300 ˚C. X-ray diffraction analysis (XRD) indicates that the films are polycrystalline, having a f.c.c zincblende structure irrespective of their substrate temperature. All the films show preferred orientation along the (1 1 1) plane parallel to the substrates. The microstructural parameters, such as the lattice constant, crystallite size, stress, strain, and dislocation density, are calculated, and the effect of substrate temperature on the deposited films was discussed. The grain size of the deposited ZnSe films is observed to be small and is within the range of 12 to 32 nm, and the grain size is observed to be increase from 12.5 to 31.9 nm with increasing substrate temperature. Optical measurements indicate the existence of a direct-bandgap-allowed optical transition with a corresponding energy gap in the range of 2.95 – 2.70 eV. Zinc-Selenide (ZnSe) thin films were prepared by using physical vapor deposition under a vacuum of 5 × 10−6 Torr by using an electron beam evaporated technique at different substrate temperatures, RT, 100, 200, and 300 ˚C. X-ray diffraction analysis (XRD) indicates that the films are polycrystalline, having a f.c.c zincblende structure irrespective of their substrate temperature. All the films show preferred orientation along the (1 1 1) plane parallel to the substrates. The microstructural parameters, such as the lattice constant, crystallite size, stress, strain, and dislocation density, are calculated, and the effect of substrate temperature on the deposited films was discussed. The grain size of the deposited ZnSe films is observed to be small and is within the range of 12 to 32 nm, and the grain size is observed to be increase from 12.5 to 31.9 nm with increasing substrate temperature. Optical measurements indicate the existence of a direct-bandgap-allowed optical transition with a corresponding energy gap in the range of 2.95 – 2.70 eV.
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S. Durairaju Nisshanthini,Antony K. Teresa Infanta S.,Duraisamy Senthil Raja,Karuppannan Natarajan,M. Palaniswamy,Jayaraman Angayarkanni 한국미생물학회 2015 The journal of microbiology Vol.53 No.4
Soil and water samples were collected from various regionsof SIPCOT and nearby Vanappadi Lake, Ranipet, Tamilnadu,India. Based on their colony morphology and their stabilityduring subculturing, 72 bacteria were isolated, of which 14isolates were actinomycetes. Preliminary selection was carriedout to exploit the ability of the microorganisms to utilizesodium cyanate as nitrogen source. Those organismsthat were able to utilize cyanate were subjected to secondaryscreening viz., utilization of sodium cyanide as the nitrogensource. The oxygenolytic cleavage of cyanide is dependenton cyanide monooxygenase which obligately requires pterincofactor for its activity. Based on this, the organisms capableof utilizing sodium cyanide were tested for the presence ofpterin. Thin layer chromatography (TLC) of the cell extractsusing n-butanol: 5 N glacial acetic acid (4:1) revealed that10 out of 12 organisms that were able to utilize cyanide hadthe pterin-related blue fluorescent compound in the cellextract. The cell extracts of these 10 organisms were subjectedto high performance thin layer chromatography (HPTLC)for further confirmation using a pterin standard. Based onthe incubation period, cell biomass yield, peak height andarea, strain VPW3 was selected and was identified as Bacillussubtilis. The Rf value of the cell extract was 0.73 which wasconsistent with the 0.74 Rf value of the pterin standardwhen scanned at 254 nm. The compound was extracted andpurified by preparative High Performance Liquid Chromatography(HPLC). Characterization of the compound wasperformed by ultraviolet spectrum, fluorescence spectrum,Electrospray Ionization-Mass Spectrometry (ESI-MS), andNuclear Magnetic Resonance spectroscopy (NMR). The compoundis proposed to be 6-propionyl pterin (2-amino-6-propionyl-3H-pteridin-4-one).
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