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Kumar, S. Rajesh,Kim, Jong Guk,Viswanathan, C.,Kim, Won Bae,Selvan, R. Kalai,Ponpandian, N. Elsevier 2018 Materials research bulletin Vol.97 No.-
<P><B>Abstract</B></P> <P>One-pot solvothermal process is adopted to develop, 3D hierarchical Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles supported 2D reduced graphene oxide sheets (Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO) as possible negative electrodes for lithium ion batteries. The synthesis parameters are optimized to prepare agglomeration-free Fe<SUB>3</SUB>O<SUB>4</SUB> nanostructures with uniform size and shape on r-GO. The field emission scanning electron microscopic (FESEM) image reveals that the 3D hierarchical Fe<SUB>3</SUB>O<SUB>4</SUB> nanostructures are uniformly decorated on r-GO. The physicochemical and functional properties of Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO are systematically investigated using various techniques. The fabricated Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO electrode delivers an initial discharge capacity of 1221mAhg<SUP>−1</SUP> at a current density of 100mAg<SUP>−1</SUP> and retains the specific capacity of 1560mAhg<SUP>−1</SUP> after 100 cycles. Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO significantly enhances cyclic performance, when compared with bare Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles due to the uniform distribution of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles on the graphene sheet with the more number of electrochemically active sites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Monodispersed Fe<SUB>3</SUB>O<SUB>4</SUB> nanostructures with different shapes synthesized by solvothermal method. </LI> <LI> The fabricated Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO electrode delivers an initial discharge capacity of 1221mAhg<SUP>−1</SUP> at 100mAhg<SUP>−1</SUP>. </LI> <LI> Fe<SUB>3</SUB>O<SUB>4</SUB>/r-GO significantly enhances the cyclic stability and rate capability than bare Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kumar, Vineet,Morrison, M.N.,Rajadurai, S.,Babu, A.M.,Thiagarajan, V.,Datta, R.K. Korean Society of Sericultural Science 2001 International Journal of Industrial Entomology Vol.2 No.2
The stink bug, Eocanthecona furcellata (Wolff.) is a natural and potential biocontrol agent of Spilarctia obliqua (Walk.). The present investigation reveals the biology, predatory efficiency and reproductive parameters of the predator which feeds on S. obliqua caterpillars in mulberry plantation. In order to find out the role of prey sine on the biology of the predators the predatory insects were separately fed with small and large caterpillars of S. obliqua. The incubation period of the eggs of E. furcellata was 8.37${\pm}$0.44 days, while the nymphal duration varied as per the prey sine. The predator when supplied with small larvae of prey, consumed 61.1 larvae and completed nymphal stage in 19.9 days; while those fed with larger prey, consumed 36.1 larvae and completed their nymphal stage in 21.55 days. The prey size also influences the reproductive parameters of the predator, The adult female predator is more voracious feeder than the adult male and consumed 41.9${\pm}$0.64 small larvae and 42.2${\pm}$0.87 large larvae during their life span. The longevity of male and female was observed as 20.7 and 29.4 days respectively. Visualization of the predator as well as the movement of the prey increases the predatory efficiency. Scanning electron microscopic studies on the feeding part explain its support in effective predation. Field observations indicated a drastic fall in the incidence of the mulberry pest, S. obliqua with the increased population E. furcellata in mulberry plantation.
Burning velocities of DME(dimethyl ether)-air premixed flames at elevated temperatures
Varghese, R.J.,Kishore, V.R.,Akram, M.,Yoon, Y.,Kumar, S. Pergamon Press 2017 Energy Vol.126 No.-
This paper reports the measurement of laminar burning velocities of DME (dimethyl ether)-air mixtures at higher mixture temperatures using planar flames stabilized in a controlled temperature mesoscale diverging channel. The reliability of this technique for flame speed measurement at high mixture temperatures has been established through various numerical studies using detailed 3-D computational model for DME-air mixtures. The distribution of fuel-air mass flux, reaction zone, and flame shape indicate that a planar flame is indeed formed in both transverse and depth directions of the channel. The stabilized flame is independent of any stretch effects except mild hydrodynamic strain due to channel divergence (30-50 s<SUP>-1</SUP>), and measured values of laminar burning velocities are within +/-5% of the actual value. The experiments were carried out at various equivalence ratios (φ = 0.7-1.4) and elevated mixture temperatures (350-640 K). The burning velocities and temperature exponents were determined using the planar flames stabilized at different mixture inlet velocities and temperatures. Slightly rich mixtures (φ = 1.1) point to the maximum burning velocity, in good agreement with recent literature at ambient conditions. Temperature exponents for different equivalence ratios increase to both sides of φ = 1.1. Numerically calculated laminar burning velocities with different chemical kinetic schemes compared well with the measured burning velocities at higher mixture temperatures.
Effect of illumination on hydrogenated amorphous silicon thin films doped with chalcogens
Sharma, S.K.,Kumar, K.N.P.,Kang, K.J.,Mehra, R.M. North-Holland 2009 Journal of non-crystalline solids Vol.355 No.31
Hydrogenated amorphous silicon thin films doped with chalcogens (Se or S) were prepared by the decomposition of silane (SiH<SUB>4</SUB>) and H<SUB>2</SUB>Se/H<SUB>2</SUB>S gas mixtures in an RF plasma glow discharge on 7059 corning glass at a substrate temperature 230<SUP>o</SUP>C. The illumination measurements were performed on these samples as a function of doping concentration, temperature and optical density. The activation energy varied with doping concentration and is higher in Se-doped than S-doped a-Si:H thin films due to a low defect density. From intensity versus photoconductivity data, it is observed that the addition of Se and S changes the recombination mechanism from monomolecular at low doping concentration films to bimolecular at higher doping levels. The photosensitivity (σ<SUB>ph</SUB>/σ<SUB>d</SUB>) of a-Si,Se:H thin films decreases as the gas ratio H<SUB>2</SUB>Se/SiH<SUB>4</SUB> increased from 10<SUP>-4</SUP> to 10<SUP>-1</SUP>, while the photosensitivity of a-Si,S:H thin films increases as the gas ratio H<SUB>2</SUB>S/SiH<SUB>4</SUB> increased from 6.8x10<SUP>-7</SUP> to 1.0x10<SUP>-4</SUP>.
Polu, A.R.,Rhee, H.W.,Jeevan Kumar Reddy, M.,Shanmugharaj, A.M.,Ryu, S.H.,Kim, D.K. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.45 No.-
<P>For the first time, the consequences of organic-inorganic hybrid nanoparticle polyhedral oligomeric silsesquioxane-polyethylene glycol (POSS-PEG(n = 4)) on the physicochemical and electrochemical properties of polyethylene oxide) (PEO)-lithium difluoro(oxalato)borate (LiDFOB) based nanocomposite solid polymer electrolyte (NSPE) membranes were systematically prepared and utilized as an active separator for battery applications. The thermal stability and structural properties of the prepared NSPE membranes were analyzed by means of differential scanning calorimetry (DSC), thermogravimetry (TG) and X-ray diffraction (XRD) analyses. The morphological changes by POSS-PEG in polymer electrolyte membranes were investigated by field emission scanning electron microscopy,(FE-SEM) and transmission electron microscopy (TEM). The incorporation of POSS-PEG greatly enhanced the ionic conductivity, mechanical integrity and compatibility. The maximum ambient temperature ionic conductivity was found to be in the range of 7.28 x 10(-5) S/cm for 40 wt% POSS-PEG. Finally, the solid state lithium cell was assembled as Li/NSPE/LiCoO2. The cell delivered a maximum discharge capacity of 187 mAh g(-1) at 0.1C-rate with very good capacity retention up to 50 cycles. The test results indicated that the electrolyte is found to be a better candidate than those reported earlier. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Some Congruence Properties for Ramanujan’s General Partitions
D. A. Radha,B. R. S. Kumar,Shruthi Hegde 장전수학회 2020 Proceedings of the Jangjeon mathematical society Vol.23 No.3
In this paper, we prove four new infinite families of congruences modulo 13 for the general partition function pr(n) for negative values of r. Our emphasis throughout this paper is to exhibit the use of q-identities to generate congru- ences for general partitions.
H M, Suresh-Kumar,R S, Kunabenchi,J S, Biradar,N N, Math,J S, Kadadevaramath Korean Society of Photoscience 2003 Journal of Photosciences Vol.10 No.3
The fluorescence quenching of 5-methyl-3-phenyl-2-[s-oxadiazol-2'-thionen5'-yl] indole by carbon tetrachloride ($CCl_4$) and aniline in different solvents viz., dioxane, benzene, toluene, methanol, propanol has been carried out at room temperature to understand the role of quenching mechanisms. The Stern-Volmer plots have been found to be linear. As probability of quenching per encounter 'p' is less than unity, and the activation energy for quenching 'E$_{a}$' is greater than the activation energy of diffusion 'E$_{d}$', it is inferred that the fluorescence of quenching mechanism is not due to material diffusion alone.e.e.
Pushpendra Kumar Dwivedi,R. Vinjamuri,S. K. Sahoo,Krishna Dutta 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Ratcheting deformation in association with bulk texture evolution in HSLA steel is studied in this investigation. The cyclicdeformation behaviors and damage modes of the specimens are obtained at room temperature, employing asymmetric stresscontrolledtests under various combinations of mean stress and stress amplitudes. Bulk texture measurements of the specimensare done adopting an X-ray diffraction analysis. The results exhibit an increase in strain accumulation from 0.23 to 30.61%associated with a sharp reduction in ratcheting life from 3320 to 880 cycles by the increment in mean stress/stress amplitude. A continuous cyclic softening until the final failure is observed for all the ratcheting tests. It is noticed that variation of meanstress is more detrimental than stress amplitude in controlling strain accumulation while the effect of stress amplitude is morepronounced than mean stress for the reduction of ratcheting life. The fracture surface morphology indicates typical striationformation in the crack propagation region along with overload failure. The bulk texture studies indicate that there is a transitionbetween ‘ϒ’ fiber and ‘ζ’ fiber during all loading conditions. The texture intensity is increased from 5.71 to 11.68 withprogressive ratcheting strain accumulation. Here also, influence of stress amplitude is more significant than the mean stress.