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Manikandan A.,Unnamalai Institute of Technology | Rajkumar R.,Mepco Schlenk Engineering College, Sivakasi
International Journal of Polymer Analysis and Characterization

This article describes the characterization of novel natural lignocellulosic bark fibers extracted from the stem of the Gossypium arboreum (cotton) plant. The G. arboreum stem fibers were treated with 5% (w/v) aqueous NaOH solution for different soaking times, and the Fourier transform infrared spectroscopy analysis was conducted to examine the chemical compounds of the raw and treated fibers. The cellulose content improved from 70.06 to 83.91% after the treatment. The X-ray diffraction results indicate that the crystalline index and size were enhanced. Thermogravimetric analysis was performed to study the thermal properties and found that the thermal stability was higher for the treated fibers. The tensile strength and modulus were increased for the alkaline-treated fibers compared to the untreated fibers. 2016 Copyright © Taylor & Francis Group, LLC Source

Ida Christy J.,Unnamalai Institute of Technology | Seenivasagam V.,National Engineering College
International Journal of Applied Engineering Research

Visual Cryptography is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares that can be stacked together to approximately recover the original image. Extended Visual Cryptographic Scheme (EVCSuses meaningful images to hide the shares of the secret image. In this paper, a new model of EVCS using ARTMAP network is presented that produces the shares with the same size as that of the original image. The results obtained are better than most existing schemes. The effectiveness of our scheme is demonstrated by real examples. © Research India Publications. Source

Raman N.,VHNSN College | Sakthivel A.,Unnamalai Institute of Technology | Jeyamurugan R.,VHNSN College
Journal of Coordination Chemistry

Schiff base mixed-ligand copper complexes [CuL1(phen)Cl 2], [CuL1(bipy)Cl2], [Cu(L1) 2Cl2], [Cu(L2)2Cl2], [CuL2(bipy)Cl2], and [CuL2(phen)Cl2] (where L1=4-[3,4-dimethoxy-benzylidene]-1,5-dimethyl-2-phenyl-1,2- dihydro-pyrazole-3-one; L2=4-[3-hydroxy-4-nitro-benzylidene]-1, 5-dimethyl-2-phenyl-1,2-dihydro-pyrazole-3-one; phen=1,10-phenanthroline; and bipy= 2,20-bipyridine) have been synthesized and characterized. Their DNA-binding properties have been studied by electronic absorption spectra, viscosity, and electrochemical measurements. The absorption spectral and viscosity results suggest that the copper(II) complexes bind to DNA via partial intercalation. The addition of DNA resulting in the decrease of the peak current of the copper(II) complexes indicates their interaction. Interaction between the complexes and DNA has also been investigated by submarine gel electrophoresis. The copper complexes cleave supercoiled pUC19DNAto nicked and linear forms through hydroxyl radical and singlet oxygen in the presence of 3-mercaptopropionic acid as the reducing agent. These copper complexes promote the photocleavage of pUC19 DNA under irradiation at 360 nm. Mechanistic study reveals that singlet oxygen is likely to be the reactive species responsible for the cleavage of plasmid DNA by the synthesized complexes. The in vitro antimicrobial study indicates that the metal chelates have higher activity against the bacterial and fungal strains than the free ligands. © 2010 Taylor & Francis. Source

Mohan R.,Institution of Engineering and Technology | Sankarrajan S.,Unnamalai Institute of Technology | Thiruppathi G.,Annamalai University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

In this study, ZnS:Ni2+ nanostructures have been synthesized through chemical precipitation method using poly (2-hydroxyethyl methacrylate) (pHEMA) as capping agent. The structural, morphological and optical properties at different pHEMA concentration of ZnS:Ni2+ were studied by using X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), UV-Vis Spectroscopy (UV-Vis), fourier transform infrared spectroscopy (FT-IR), Photoluminescence (PL). The Average crystalline size of the nanoparticles was found to be in the range of ∼3.59-4.36 nm. The surface morphological analysis reveals that the pHEMA capped nanoparticles showed homogeneous smooth surface. HR-TEM analysis reminds the original size of pHEMA capped nanoparticles. The band gap investigation revealed the size dependent of quantum confined nanoparticles. The immobilized nanoparticles in pHEMA matrix were verified by FT-IR studies. Novel luminescence properties have been observed for uncapped and pHEMA capped ZnS nanoparticles. The optimal capping concentration was successfully determined and its influence on photoluminescence behavior has been thoroughly analyzed. © 2015 Elsevier B.V. All rights reserved. Source

Ida Christy J.,Unnamalai Institute of Technology | Seenivasagam V.,National Engineering College
International Journal of Security and its Applications

Conventional visual secret sharing schemes generate noise-like random pixels on shares to hide secret images. It suffers a management problem, because of which dealers cannot visually identify each share. This problem is solved by the Extended Visual Cryptography Scheme (EVCS), which adds a meaningful cover image in each share. However, the previous approaches involving the EVCS for color images suffer from a pixel expansion problem. In this paper, we propose a general approach to solve the abovementioned problem; the approach can be used for color images in non computer-aided decryption environments. The proposed approach uses Feed Forward Network to construct the shares. The experimental results indicate that a solution to the pixel expansion problem of the EVCS is achieved. Moreover, the display quality of the recovered image is better than that obtained using other VC schemes. © 2015 SERSC. Source

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