http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Effect of Surface Condition on the Torsional Fatigue Behaviour of 20MnCr5 Steel
S. Ramesh,S. Natarajan,V. J. Sivakumar 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Torsional fatigue behaviour of steel is influenced by various significant factors on the surface of steel such as the stress state,the metallurgical conditions and the surface roughness etc. This research presents the results of the studies conducted on thetorsional fatigue life of steel for different surface stresses, conditions and microstructures. Based on the results, inferenceswere derived out of the factors and conditions which are instrumental in increasing the fatigue performance. This researchis done with the purpose of increasing the fatigue performance of power train shafts processed through vacuum carburizingfollowed by second tempering. The fatigue tests were conducted using a bi-directional torsional cyclic loading in a MTSmake torque testing machine. Various researches has been conducted in this paper to find out the impact of surface roughness,second tempering, inter granular oxidation and carbon case depth on the transmission shafts. The existence of surfaceretained austenite has not yielded a notable enhancement in fatigue performance in the power train shaft whereas existenceof martensite with minimum fraction of retained austenite enhanced the fatigue performance significantly from 12,000 to35,000 cycles on ± 3100 N m torque load.
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.
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).
Effect of Lanthanum Addition on Grain Refinement and Mechanical Properties of Mg–9Li–3Al Alloy
P. Dinesh,S. P. KumareshBabu,S. Natarajan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
The impact of lanthanum addition on the microstructural changes and mechanical characteristics of Mg–9Li–3Al + xLaalloys are studied. The alloys are fabricated through a liquid metallurgy route involving stir casting by an electrical resistancefurnace. The microstructural analysis showed that the as-cast alloys primarily comprises of α-Mg and β-Li phases. Irregular distribution of Al–Li lamellar and some granular fragments MgLi2Alobserved over the magnesium-rich α-phaseand lithium-rich β-phase. The influence of lanthanum addition to the alloy system leads to grain refinement by formingAl11La3and Al4Laintermetallics. Among the series of cast alloys, the Mg–9Li–3Al–1La alloy exhibits excellent ultimatetensile strength—178 MPa with 10.2% elongation. Addition of 1.5 wt% La and beyond tends to coarsen the grains leadingto a reduction in mechanical strength. Hot extruded Mg–9Li–3Al–1La alloy exhibited more refinement in the microstructureand breakdown of intermetallic (Al4La and Al11La3)is observed. A significant improvement in the UTS values around 39%displayed by the Mg–9Li–3Al–1La alloy extruded at a ratio of 25:1.