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Prem kumar T.,Kodaikanal Institute of Technology | Sankaranarayanan K.,Alagappa University
Canadian Journal of Chemical Engineering | Year: 2013

Application of ethylenediamine tetraacetic acid (EDTA) in the chemical bath solution to enhance the physical and optical properties of chemical bath deposited CdS film was realised. The observed beneficial effect on the crystallisation of CdS crystallites in the bath solution followed by deposition on glass substrates reduces the amorphousity and enhances the crystallinity of the film. The optical transparency of the film attains a maximum of 80% over the wavelength range of 650-1100nm for the film deposited from EDTA-added solution having the concentration of 0.006mol/L. Also, the observed intensity of the characteristic photoluminescence emission was found to be dependent on the concentration of EDTA in the bath solution. © 2011 Canadian Society for Chemical Engineering.

Selvaganapathy M.,VHNSN College | Selvaganapathy M.,Kodaikanal Institute of Technology | Pravin N.,VHNSN College | Muniyandi V.,VHNSN College | And 2 more authors.
Journal of Photochemistry and Photobiology B: Biology | Year: 2016

A new series of cysteine-based metal(II) complexes with 2,2′-bipyridine or 1,10-phenanthroline as co-ligand have been prepared and characterized. Their DNA binding and cleavage properties have been studied. The analytical and spectroscopic data of complexes 1-18 reveal that the complexes adopt an octahedral geometry around the central metal ion in which the cysteine is coordinated through NS and NN atoms, respectively. Spectroscopic titration and viscosity measurements reveal that the complexes bind to DNA through an intercalative mode. Electrophoresis measurements exhibit that they cleave pBR322 DNA efficiently in the presence of 3-mercaptopropionic acid (MPA), probably via hydrolytic mechanism with the involvement of •OH. The in vitro anticancer activities indicate that the Cu(II) complexes are active against four selected human tumor cell lines. Furthermore, it is remarkable that all the complexes exhibit significant photocytotoxicity against human breast cancer cell lines (MCF-7) with a potency more than the widely used drugs photofrin and cisplatin indicating that they have the potential to act as effective anticancer drugs in a dose-dependent manner. © 2016 Elsevier B.V. All rights reserved.

Subrammanian A.,St Peters University | Jabaraj D.B.,Kodaikanal Institute of Technology | Bupesh Raja V.K.,Sathyabama University
Transactions of the Indian Institute of Metals | Year: 2016

Resistance spot welding is widely used as a sheet metal joining process, especially in automotive and rail coach manufacturing industries. Ferritic stainless steel (FSS) is used for structural applications in these areas, owing to its superior corrosion resistance compared to conventional carbon steels. In this paper, mechanical properties and microstructure of resistance spot welded FSS joints to grade AISI 409M was investigated. Tensile shear test and micro hardness test were carried out to assess the mechanical properties and failure characteristics of weld joints. Microstructure was evaluated with optical microscopy. The effect of welding current on nugget growth, peak load, fusion zone (FZ) hardness, failure energy and failure mode were analyzed at various current ratings, keeping electrode force, weld cycle time and electrode tip diameter as constants. The results showed that, with the increment in welding current, tensile shear strength increased. Nugget diameter was found to be increasing with increase in current, in expulsion free welds. At low currents, failure mode was found to be interfacial and the pull out mode of failure occurred, at relatively higher current values. Average FZ hardness was found to be more than that of base metal (BM) but less than that of maximum hardness at heat affected zone. Grain enlargement was noticed at high temperature heat affected zone. FZ microstructure consists of predominantly columnar ferrite. Failure occurred at the BM region in all the samples welded above 10 KA current. © 2015, The Indian Institute of Metals - IIM.

Shanmugavadivu P.,Gandhigram Rural Institute | Thenmozhi G.,Kodaikanal Institute of Technology
IEEE Proceedings of the INternational Conference On Emerging Trends in Science Engineering and Technology: Recent Advancements on Science and Engineering Innovation, INCOSET 2012 | Year: 2014

This paper provides a new segmentation technique to detect microcalcifications in mammogram images. It describes the principle of modified GrabCut Segmentation technique. This new GrabCut technique uses k-Means algorithm instead of Gaussian Mixture Model (GMM) to compute the clusters. The texture component is integrated into this GrabCut framework to detect the texture-based boundaries that enables a highly accurate and efficient segmentation. © 2012 IEEE.

Devakumar D.,St Peters University | Jabaraj D.B.,Kodaikanal Institute of Technology | Bupesh Raja V.K.,Sathyabama University
ARPN Journal of Engineering and Applied Sciences | Year: 2015

In this paper the effect of the mechanical/thermo mechanical processing on the mechanical and metallurgical properties of low carbon steels, viz, Cold Reduced low carbon Steel (CRS) and Themo Mechanically Treated (TMT) steel are discussed. These steels are widely used in automobile, railways, naval architecture, petroleum industry, etc, applications with exposure to extreme temperature conditions and subjected to stress and exposed to corrosive environment [1]. The most commonly used type of steel are low carbon steel, High Strength Low Alloy Steel (HSLA), Cold Rolled Steel and Hot Rolled steel (HRS). The mechanical properties like ductility, strength and metallurgical properties like microstructure, grain size, etc, influence the properties of the rolled steels. In this paper an effort is made to study the research reported in literature, on the innovations in processing of low carbon steel through grain refinement and heat treatment to produce steel possessing good mechanical and metallurgical properties. © 2006-2015 Asian Research Publishing Network (ARPN).

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