St Hindu College

Nāgercoil, India

St Hindu College

Nāgercoil, India
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Sathiamoorthy J.,Thiruthangal Nadar College | Ramakrishnan B.,ST Hindu College
Wireless Personal Communications | Year: 2017

Ad hoc networks like MANETs can be made manageable by clustering the network where a cluster head is given the responsibility of an arbitrator. To make clustering more efficient, fuzzy clusters can be used to ensure faster cluster formation and reliable data delivery. A wireless sensor network such as MANETs can then have an extended lifetime with the workload being distributed evenly. This paper proposes a competent fuzzy approach in cluster formation. The proposed approach has two significant stages, one which helps in the formation of fuzzy clusters and the other introduces a 3-level filtering technique. The former makes MANETs efficient and manageable and the latter helps in identifying trusted nodes for communication. The modified Fuzzy C-means clustering technique is entrusted with the task of assigning membership to each and every data point linked to each singular cluster center used in the formation of clusters, while a special filter scheme is used to distinguish between the trusted nodes and the malicious nodes. This helps is determining the identity and authenticity of the cluster members’. Eventually only the trusted nodes will be part of the communication range. The filter based fuzzy clustering approach can be used to determine the perfect nodes, which will reflect in the network performance. This also helps in improving the packet transmission in ad hoc networks like MANETs. © 2017 Springer Science+Business Media, LLC

Sathiamoorthy J.,Thiruthangal Nadar College | Ramakrishnan B.,ST Hindu College
Soft Computing | Year: 2017

Security is a major issue that is being constantly addressed in infrastructure less networks. An ad hoc network like MANET faces several issues that can jeopardize the transmissions in the network. A MANET can be made manageable by clustering it and appointing a cluster head. The cluster head communicates with the other cluster heads through base station. The cluster head routes all traffic from its members with the help of the base station, both within and outside the cluster. Several schemes have been suggested to find and eliminate malicious nodes that may hinder transmission. However, when the cluster member or the cluster head turns malicious, it may damage the transmission by tampering with the data and the routing policies. Though the security schemes target the nodes, they do not have specific techniques to handle a situation where the cluster member and cluster head turn malicious. Because of the constraints prevalent in the election of the cluster head and the selection of the cluster member, an intruder can penetrate and be elected as the cluster head or a member. Our proposed approach tries to counteract this situation by using a two-phase approach. The first phase uses fuzzy rules to form clusters and the second phase uses an efficient three-tier filtering methodology to identify the reliable nodes within the network. For the clustering process, a modified fuzzy C-means clustering algorithm (MFCM) is used to form the clusters. The three-tier filtering methodology decides the authenticity of the nodes by using an efficient filtering process. Our proposed technique can assure a better performance and enhanced throughput when compared to the existing techniques of EAACK. © 2017 Springer-Verlag GmbH Germany

Karthick T.,Vivekanandha College for Women | Balachandran V.,AA Government Arts College | Perumal S.,St Hindu College | Nataraj A.,Th Roever College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

In this work, the vibrational characteristics of 2-chloro-5- (trifluoromethyl) aniline have been investigated and both the experimental and theoretical vibrational data indicate the presence of various functional groups within the title molecule. The influence of chlorine substituent on the vibrational wavenumbers of a molecule in comparison with aniline and trifluoromethyl aniline has been discussed in detail. The density functional theoretical (DFT) computations were performed at the B3LYP/6-31++G(3df,3pd)/6- 31G(3df,3pd) levels to derive the optimized geometry, vibrational wavenumbers with IR and Raman intensities. Furthermore, the molecular orbital calculations such as; natural bond orbitals (NBOs) and HOMO-LUMO energy gap and mapped molecular electrostatic potential (MEP) surfaces were also performed with the same level of DFT. The temperature dependence thermodynamic parameters of a molecule were illustrated on the basis of their correlation graphs. The detailed interpretation of the vibrational spectra has been carried out with the aid of potential energy distribution (PED) results obtained from MOLVIB program. The delocalization of electron density in various constituents of the molecule has been discussed with the aid of NBO and HOMO-LUMO energy gap analysis. © 2013 Elsevier B.V. All rights reserved.

Muthucumaraswamy R.,Sri Venkateswara College of Engineering | Prasad G.E.,St Hindu College
Journal of Applied Fluid Mechanics | Year: 2013

An exact analysis of rotation effects on unsteady flow of an incompressible and electrically conducting fluid past a uniformly accelerated infinite isothermal vertical plate with variable mass diffusion, under the action of transversely applied magnetic field has been presented. The plate temperature is raised to Tw and the concentration level near the plate is raised linearly with time. The dimensionless governing equations are solved using Laplace-transform technique. The velocity profiles, temperature and concentration are studied for different physical parameters like magnetic field parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, Prandtl number and time. It is observed that the velocity increases with increasing values of thermal Grashof number or mass Grashof number. It is also observed that the velocity increases with decreasing magnetic field parameter or rotation parameter Ω.

Ezhilan B.P.,St Hindu College | Neelamegam R.,St Hindu College
Pharmacognosy Research | Year: 2012

Background: The presence of diverse secondary metabolites has been reported from species of the genus Polygonum. However, there has been not much information available on phytochemical components and biological activity in the whole plant ethanol extract of Polygonum chinense L. Objective: This study was designed to determine the phytocomponents in the whole plant ethanol extract of P. chinense. Materials and Methods: GC-MS analysis of the whole plant ethanol extract of P. chinense was performed using a Perkin-Elmer GC Clarus 500 system comprising an AOC-20i auto-sampler and a gas chromatograph interfaced to a mass spectrometer (GC-MS). Results: This investigation was carried out to determine the possible chemical components from P. chinense by GC-MS. This analysis revealed that the ethanol extract of P. chinense (whole plant) contained mainly a triterpene compound-squalene (47.01%), and a plasticizer compound-1,2- benzenedicarboxylic acid, mono[2-ethylhexyl]ester (40.30%). All identified compounds were, generally, reported as having antimicrobial activity. In addition, the squalene compound also having anti-cancer, anti-oxidant, anti-tumor, chemo-preventive, pesticidal and sun-screen properties, while the plasticizer compound -1,2-benzenedicarboxylic acid, mono[2-ethylhexyl] ester reported to have anti-oxidant and anti-inflammatory properties. No activity was reported in the alcoholic compound-4-hexene-1-ol, 5-methyl-2-(1-methylethanyl)- acetate-(R)-. Conclusions: From the results, it is evident that P. chinense contains various bioactive compounds and is recommended as a plant of phytopharmaceutical importance.

Thanu T.C.,St Hindu College
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2017

It is well known that the nano materials on aging undergoes agglomeration resulting in the increase in the particle size with time. To overcome this issue the nano materials can be encapsulated in some other material like resins, polymers etc. Polymer nanocomposite is a new class of hybrid nanomaterial that gains significant attention mainly because of their novel and unique functional characteristics. Development of nanocomposites comprising both organic and inorganic materials with tailor made properties is a challenge. The characteristics of nanocomposite mainly depends on the constituent elements and the manner in which they are integrated within the composite entity. The present work is intended to prepare polymer nanocomposites of poly(o-toluidine) (POT) incorporating nano copper oxide (n-CuO) of three different compositions and to study its properties at the function of its compositional changes. For the first time, we report the synthesis of POT-n-CuO hybrid materials and their photocatalytic activities. Hence, exploration of influencing factors on the property emergence of resultant nanocomposite material is crucial one. Selected quantity of n-CuO incorporations leads to alter the noncrystalline state of POT into crystalline. It regulates the structural organizations of POT matrix and helps to emerge with composite polycrystalline phases. Observed XRD results ensured the emerged monoclinic structure of CuO, orthorhombic structure of copper hydroxide and POT. UV–Vis investigations recorded were used to estimate the band gap values as 2.44, 2.38 and 2.32 eV respectively for 25, 50 and 75 wt% of n-CuO incorporated POT composite samples. Fourier transform infrared reveals strong CuO–POT interaction. Morphological characterizations confirms the n-CuO influenced structural modifications in nanocomposite samples. Thermogravimetric analysis reveals the enhanced thermal stability of samples as the composition changes with n-CuO. These composites were also subjected to the photocatalytic studies for degradation of IC dye and their efficacy is good in the present of sunlight. Among the three samples POTCu75 exhibited better photocatalytic activity when studied under solar simulator. © 2017 Springer Science+Business Media, LLC

Magdaline J.D.,Rani Anna Government College | Chithambarathanu T.,St Hindu College
Materials Today: Proceedings | Year: 2015

The molecular structure and vibrational spectra of 5-Nitro-2-furoic Acid (NFC) have been investigated by combined theoretical and experimental approaches. The FT-IR and FT-Raman spectra of NFC was recorded in the range 4000 - 400cm-1 and 3500 -50 cm-1. Density functional method B3LYP with 6-31G** basis set was applied to carry out the quantum mechanical calculations of the geometrical structure and vibrational analysis of NFC. The spectra were interpreted with the aid of normal coordinate analysis (NCA) based on scaled quantum mechanical force field (SQM). Stability of the molecule arising from the hyper conjugative interactions, charge delocalization have been analyzed using natural bond analysis(NBO). The influence of the substituents on the geometry of the furan ring and its normal modes of vibration have been discussed. © 2015 published by Elsevier Ltd.

Mary Kensa V.,St Hindu College
Journal of Industrial Pollution Control | Year: 2011

Bioremediation is an ecologically sound and state of the art technique that employs natural biological processes to completely eliminate toxic contaminants. Any process that uses micro organisms, fungi, green plants or their enzymes to return the natural environment altered by contaminants to its original condition. Bioremediation technologies can be generally classified as in situ or ex situ. In situ bioremediation involves treating the contaminated material at the site while ex situ involves the removal of the contaminated material to be treated elsewhere. Some examples of bioremediation technologies are bioventing, landfarming, bioreactor, compositing, bioaugmentation, rhizofiltration, and bio-stimulaiton. Micro organism which perform the function of bioremediation is known as Bioremediators. (bioaugmentation). Not all contaminants, however, are easily treated by bioremediation using microorganisms. For example, heavy metals such as cadmium and lead are not readily absorbed or captured by organisms, the assimilation of metals such as mercury into the food chain may worsen matters. This paper gives an idea of what is bioremediation, principles of bioremediation, factors of bioremediation, strategies, types, genetic engineering approaches, monitoring bioremediation and advantages or disadvantages of bioremediation. © EM International.

Mary Kensa V.,St Hindu College
Ecology, Environment and Conservation | Year: 2011

Emergence of resistance among mosquitoes is a recent problem. Safe and ecofriendly agents from biological origin is need of the hour. An attempt is made in the present study to analyse the larvicidal effects of the plant leaves extract against anopheles mosquito. Among these selected plants, Catharanthus roseus, Phyllanthus amarus, Acalypha indica, zingiber officinale, cynodon dactylon and Aerva lanata showed the highest level of activity against mosquito larvae. In conclusion, the results obtained that the leaves extract used had some bioactive constituents which resulted in the larvicidal effects. Such findings are useful in promoting research aimed at the development of new agents for mosquitoe control, based on bioactive natural chemical components from indigenous plant sources. The use of indigenous plant based products by individual and community can provide a prophylactic measure for protecting against various mosquito borne diseases. Copyright© EM International.

Murali K.R.,CSIR - Central Electrochemical Research Institute | Kalaivanan A.,Arignar Anna College | Perumal S.,St Hindu College | Pillai N.N.,St Hindu College
Journal of Alloys and Compounds | Year: 2010

Cadmium oxide (CdO) films were deposited by the sol-gel dip coating using acrylamide route. The films were doped with different concentrations of gallium in the range of 500-3500 ppm. X-ray diffraction studies indicated the films to possess cubic structure. The grain size, strain, lattice parameter, dislocation density, texture coefficient were estimated from the XRD pattern. The texture coefficient varies in the range of 0.16-0.61 for the different peaks. Optical transmission measurements indicated direct and indirect band gap values of 2.59 and 2.06 eV. Electrical conductivity of the undoped film was 0.5 x 103 mho cm-1, after doping with aluminium, the conductivity increased to 1.5 x 103 mho cm-1. Mobility decreased from 250 to 35 cm2 V-1 s-1 with an increase of Al concentration. Solar cell studies made on the Si/CdO cells under an illumination of 90 mWcm-2 yielded an Voc of 0.62 V, Jsc of 16 mAcm-2, ff=0.76 and ν = 9.55%. © 2009 Elsevier B.V. All rights reserved.

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