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G. Rajesh Kannan,P. Sathiya,T. Deepan Bharathi Kannan,M. Bhuvanesh Kumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
In this work, the technique of spin arc welding has been used to weld HSLA steel of grade 15CDV6. Experiments wereperformed according to the L9 Taguchi matrix using current, travel speed, wire feed rate, and spin rotation speed as inputparameters. The quality of the weld was analysed by measuring the bead geometry and microhardness. The Whale OptimizationAlgorithm (WOA) was used to identify the optimized welding parameters. The optimised parameters were identifiedthrough WOA as follows: current 230 A, voltage 24 V, travel speed 720 mm/min, and spin rotation speed 1500 rpm. Thepost-weld heat treatment (PWHT) was performed on the optimised welded sample to enhance the weld properties. Themicrohardness was increased by 79% after PWHT. Ferrite content was found to have reduced after welding and PWHT thegrain size and structure of the BM, HAZ, and WM were analysed by EBSD technique. The decrease in ferrite content hada significant effect on the microhardness. The Energy Dispersive Spectroscopy results showed the presence of Vanadiumcarbide (VC) precipitates which helped in increasing the microhardness.
Kannan, R.,Kim, A.R.,Nahm, K.S.,Yoo, D.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.16
<P>The formation of organic poisoning intermediate species during fuel (alcohol) oxidation over a noble-metal catalyst electrode retards the electrooxidation reaction. To address this problem, we report the synthesis of a manganese-titanium-oxide-hydroxide-supported palladium nanocatalyst (Pd@MTOH), whereby a hydrothermal reaction is followed by an in situ reduction process. The physical characterizations confirm the formation of Pd NPs and a mixed-valance MTOH. The voltammetric-study results for the Pd@MTOH show a high level of electrochemical activity toward alcohol (methanol, ethylene glycol, and xylitol), and oxidation toward the Pd@MnOOH and Pd@C electrodes. At the Pd@MTOH electrode, the poisonous intermediate species that were formed during alcohol electrooxidation were successfully removed at a higher forward potential; the excellent catalytic activity, better intermediate tolerance, and sound long-term stability of the Pd@MTOH electrode can be credited to the uniform dispersion of the Pd NPs and the support (MTOH). This work outlines a facile method for the fabrication of a catalyst with a high electrochemical performance and great potential in alcohol fuel-cell applications. Copyright (C) 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
Kannan, Ramanujam,Kim, Ae Rhan,Nahm, Kee Suk,Yoo, Dong Jin American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.3
<P>The development of a facile, instep, and eco-friendly synthesis method of mono-dispersed low quantity palladium nanoparticle/carbon@functionllized carbon nanotube composite (Pd@C-f-CNT) electrocatalytic material was developed for use in the electrooxidation of xylitol. The prepared nanocatalyst was analyzed by powder X-ray diffraction analysis, Raman spectroscopy, X-ray photoelectron spectroscopy, and scanning and transmission electron microscopy. The electrocatalytic studies were performed using voltammetric methods. Formation of Pd NPs was observed within 2 min. The microscopic analysis showed 5- to 10-nm-sized Pd NPs that uniformly covered the CNT. The instep-formed carbon helped to improve the electrocatalytic activity of the catalyst. Our proposed method provides new insight for the development of highly efficient metal NPs/CNT nanocatalyst for direct alcohol fuel cell applications.</P>
CRYPTOGRAPHIC ALGORITHM INVOLVING THE MATRIX Q<sup>p*</sup>
Kannan, J.,Mahalakshmi, M.,Deepshika, A. The Kangwon-Kyungki Mathematical Society 2022 한국수학논문집 Vol.30 No.3
Cryptography is one of the most essential developing areas, which deals with the secure transfer of messages. In recent days, there are more number of algorithms have been evolved to provide better security. This work is also such an attempt. In this paper, an algorithm is presented for encryption and decryption which employs the matrix Q<sup>p*</sup> and the well- known equation x<sup>2</sup> - py<sup>2</sup> = 1 where p is a prime.
FUZZY ERROR MATRIX IN CLSSIFICATION PROBLEMS
Kannan, S.R.,Ramathilagam, S.R. Korean Society of Computational and Applied Mathem 2008 Journal of applied mathematics & informatics Vol.26 No.5
This paper concerns a new method called Fuzzy Supervised Method for error matrix, the method has developed based on Adoptive Neuro- Fuzzy Inference Systems(ANFIS). For the performance point of view initially the new method tested with trial data and then this paper applies the proposed method with real world problems. So that this paper generated 1000 random error matrices in programming language [R] and then it tests the new proposed method for the error matrices. The results of Fuzzy Supervised Method given in terms of Kappa Index and Congalton Accuracy Indexes, and performance of Fuzzy Supervised Method has evaluated by using Pearson's test.
Kannan, Thandavan Arthanari,Ramesh, Geetha,Ushakumary, S.,Dhinakarraj, Gopalan,Vairamuthu, Subbiah Korean Society of Animal Science and Technology 2015 한국축산학회지 Vol.57 No.10
The present study was aimed to study the light and electron microscopic studies of thymic Hassall's corpuscles was done in various age groups of Nandanam Chicken ranging from day-old to forty weeks. Hassall's corpuscles are special, unique structures present in thymic medulla and also in the cortex of all the age groups of Nandanam chicken (from hatch to forty weeks) in the present study. Size of the Hassall's corpuscles in the medulla is larger than the ones present in the cortical region of thymus. The Hassall's corpuscles are made up of structureless eosinophilic mass surrounded by concentrically arranged reticuloepithelial cells. Under electron microscope, the Hassall's corpuscles were composed of reticuloepithelial cells interconnected by many desmosomes. The epithelial cells had abundance of cytoplasmic fibrils and desmosomes with few mitochondria and ribosomes. The nucleus was oval or round which was slightly indented. The centre of the Hassall's corpuscles was appeared either solid or cystic. The cystic corpuscles had cell debris within the cyst lumen.
Kannan, Aravindaraj G.,Samuthirapandian, Amaresh,Kim, Dong-Won Elsevier 2017 Journal of Power Sources Vol.337 No.-
<P><B>Abstract</B></P> <P>Hierarchically porous graphene nanosheets co-doped with nitrogen and sulfur are synthesized via a simple hydrothermal method, followed by a pore activation step. Pore architectures are controlled by varying the ratio of chemical activation agents to graphene, and its influence on the capacitive performance is evaluated. The electric double layer capacitor (EDLC) assembled with optimized dual-doped graphene delivers a high specific capacitance of 146.6 F g<SUP>−1</SUP> at a current density of 0.8 A g<SUP>−1</SUP>, which is higher than that of cells with un-doped and single-heteroatom doped graphene. The EDLC with dual-doped graphene electrodes exhibits stable cycling performance with a capacitance retention of 94.5% after 25,000 cycles at a current density of 3.2 A g<SUP>−1</SUP>. Such a good performance can be attributed to synergistic effects due to co-doping of the graphene nanosheets and the presence of hierarchical porous structures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen and sulfur co-doped, hierarchically porous graphene is synthesized. </LI> <LI> EDLC with co-doped graphene exhibits high capacitance and good cycling stability. </LI> <LI> Good performance is attributed to co-doping and hierarchical porous structures. </LI> </UL> </P>