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( Kumaravel Vignesh ),곽병섭,강미숙 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
A magnetic nanocomposite composed of manganese ferrite (MnFe<sub>2</sub>O<sub>4</sub>), graphitic-carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) and titanium dioxide-P25 (TiO<sub>2</sub>) was synthesized via chemical impregnation method. The as-synthesized nanocomposite (MnFe<sub>2</sub>O<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub>) was characterized through XRD, FE-SEM, TEM, EDX, UV-vis-DRS, photoluminescence (PL), B.E.T. surface area analysis, X-ray photo-electron spectroscopy and vibrating sample magnetometery (VSM) techniques. The photocatalytic activity was tested for the degradation of methyl orange (MO) dye as a model pollutant under simulated solar light irradiation. It was found that MnFe<sub>2</sub>O<sub>4</sub>/g-C<sub>3</sub>N<sub><sub>4</sub></sub>/TiO<sub>2</sub> displayed excellent photocatalytic activity than that of g-C<sub>3</sub>N<sub>4</sub>, MnFe<sub>2</sub>O<sub>4</sub> and MnFe<sub>2</sub>O<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub>. The enhancement in the photocatalytic activity was ascribed to the synergism between TiO<sub>2</sub>, g-C<sub>3</sub>N<sub>4</sub> and MnFe<sub>2</sub>O<sub>4</sub>.
Novel Strategy for Malic Acid Production in Recombinant Escherichia coli via Protein Colocalization
Kumaravel ASHOKKUMAR,Jae Hoon JEONG,Soon Ho HONG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Protein scaffold complex strategy was introduced between the enzymes phosphoenolpyruvate carboxylase (Ppc) and malate dehydrogenase (MdhA) in non-oxidative malic acid pathway (Fig. 1). The protein scaffold can increase the carbon flux towards the malic acid production by closely co-localization of pathway enzymes. Various culture conditions such as pH, temperature and glucose concentration were optimized for effective malic acid production. Similarly, various competing pathway mutant E. coli strains were also tested for improved malic acid production.
Comparative structural analysis of lattice hybrid and tubular wind turbine towers
R. Kumaravel,A. Krishnamoorthy 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.1
This paper presents a comparative structural analysis of lattice hybrid tower with six legs with conventional tubular steel tower for an onshore wind turbine using finite element method. Usually a lattice hybrid tower will have a conventional industry standard \'L\' profile section for the lattice construction with four legs. In this work, the researcher attempted to identify and analyze the strength of six legged lattice hybrid tower designed with a special profile instead of four legged L profile. And to compare the structural benefits of special star profile with the conventional tubular tower. Using Ansys, a commercial FEM software, both static and dynamic structural analyses were performed. A simplified finite element model that represents the wind turbine tower was created using Shell elements. An ultimate load condition was applied to check the stress level of the tower in the static analysis. For the dynamic analysis, the frequency extraction was performed in order to obtain the natural frequencies of the tower.
Electronic Structure of Nano-Sized ZnO: A Compton Profile Study
R. Kumaravel,M. C. Mishra,B. K. Sharma,V. Vyas,G. Sharma 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.1
The electronic structure of nano-sized ZnO using Compton scattering technique is reported. The nano-crystalline ZnO of size 10.5 nm is synthesized using the chemical route and characterized by XRD, SEM, TEM probes. Using 59.54 keV gamma-rays, the Compton profile measurements are performed on nano-sized as well as bulk ZnO. The present study reveals the narrower electron momentum density in nano-sized ZnO as compared to bulk sample. The ionic model based free atom Compton profiles for a number of configurations of Zn+xO−x (0.0 ≤ x ≤ 2.0) are also performed to estimate the charge transfer on compound formation. The present study suggests different amount of charge transfer from Zn to O atom in the nano-sized and bulk ZnO.
P. Kumaravel,K. Venkatesh Raja,P. Suresh 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
Present research uses SiC, TiO2 and Ni-Gr nanoparticles as supplementary additions to enhance overall machining, andmechanical characteristics of derived LM26 aluminium matrix composites. The bottom pouring type stir casting techniquewith the two-step feeding method is employed for the development of proposed Composites. Tensile, micro hardness, andimpact strength as well as metal removal rate (MRR), Tool wear rate (TWR) of electric discharge machining (EDM) wereevaluated to determine the optimal nanoparticle combination that exhibits the best attributes. Results reveal that secondaryreinforcements improve the mechanical performance of the samples significantly. At the same HAMC5 exhibits bettermechanical, and machining performance and reasonable particle distribution. HAMC5 exhibits 35% higher tensile strength,impact and hardness about 88.3 BHN and 53.8 Joules respectively, which is higher than neat samples.