NGM College

Pollachi, India

NGM College

Pollachi, India

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Sakunthala A.,National University of Singapore | Sakunthala A.,Bharathiar University | Reddy M.V.,National University of Singapore | Selvasekarapandian S.,Bharathiar University | And 3 more authors.
Journal of Physical Chemistry C | Year: 2010

Lithium trivanadate (LiV3O8) compound was prepared under different conditions and characterized by the Rietveld-refined X-ray diffraction, scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area and density techniques. The electrochemical performances of the LiV3O8 compounds prepared under different conditions were compared. LiV3O8 rods prepared by the surfactant-assisted polymer precursor method were found to perform well, delivering a discharge capacity of 230 (±5) mA·h/g at the end of the second cycle, with an excellent capacity retention of 99.52% at the end of the 20th cycle, for a current density of 30 mA/g. LiV3O8 rods delivered a discharge capacity of 135 (±5) mA·h/g at the end of 350 cycles, for a current density of 240 mA/g, and reasonably high capacity values were achieved at the different current rates. Impedance spectroscopic studies during the first and eighth cycles at various voltages are analyzed and discussed. © 2010 American Chemical Society.


Sakunthala A.,National University of Singapore | Sakunthala A.,Bharathiar University | Reddy M.V.,National University of Singapore | Selvasekarapandian S.,Bharathiar University | And 3 more authors.
Energy and Environmental Science | Year: 2011

The bare V2O5 and doped (V1.95M0.05)O5 (M = Nb, Ta) nano/submicron sized compounds were prepared by the simple polymer precursor method. The compounds were characterized by different physical and electroanalytical techniques. The effects of doping and different synthesis conditions on the energy storage performance of the V2O5 compounds were discussed. All compounds delivered a discharge capacity (at the end of the 2nd cycle) in the range 245 to 261 (±3) mA h g-1, except for the tantalum doped compound (V1.95Ta0.05)O5 which exhibited a discharge capacity of 210 (±3) mA h g-1, cycled in the range 2.0-4.0 V at a current rate of 120 mA g-1. An excellent cycling stability of 96% till twenty cycles was achieved for the compound V2O5 prepared by the polymer precursor method. Electrochemical impedance spectroscopy studies at different voltages during discharge and charge cycles were discussed in detail. © The Royal Society of Chemistry 2011.


Rajasenathipathi M.,NGM College
International Journal of Applied Engineering Research | Year: 2015

Braille is an important language used by the visually impaired to read and write. It is vital for communication and educational purposes. The Braille code has become the main system for the majority of those blind people who read and write using tactile approach. Tactile means sense by touching or rubbing the surface of the corresponding output device This paper proposes a vibrating Braille glove which helps the deaf and blind people benefit from the latest computer technology, by means of a vibration inside the hand glove. This is connected to a computer using hardware control procedures and a screen input program for communication purposes. The vibrations in six different positions in the hand glove match the Braille code. So the blind person can understand the characters of English language. In this study it explains the software design of English text to Braille code conversion, Hardware design of Braille Hand glove, Braille equivalent vibrations in six different positions in the Braille glove using hardware control procedure numbers and how it is tested using serial and parallel mode. This system puts forward the new idea for the benefit of deaf and blind people, who prefer to work in computer environment. © Research India Publications.


Devi E.R.,NGM College
International Journal of Applied Engineering Research | Year: 2015

The objective of the design methodology of a Fuzzy Logic Controller is to control the controllable risk factors and to predict the severity of cardiac and renal problems of Diabetic patients. In this paper, the controllable risk factors “Blood Sugar, Insulin, Ketones, Lipids, Obesity, Blood Pressure and Protein/Creatinine ratio” are considered as input parameters and the “stages of cardiac”(SOC) and the “stages of renal” (SORD) are considered as the output parameters. The triangular membership functions are used to model the parameters. In spite of many advanced equipments and devices available in health care system to control the disease, the proposed controller simultaneously control and maintain all the seven controllable risk factors at normal condition to avoid the unexpected failure of cardiac and renal system. The proposed controller also classify the patients with high risk and low risk using fuzzy c means clustering technique, so that the patients with high risk are treated immediately. The proposed system is validated with MatLab, and is used as a tracking system with accuracy and robustness. In this work, the basic logic circuit has been designed to implement the rule base but in future the Micro Electro Mechanical System (MEMS) can be employed based on the logic circuit designed which integrates a large number of systems to be built on a single chip. © Research India Publications.


Sashi K.,SNR Sons College | Thanamani A.S.,NGM College
Future Generation Computer Systems | Year: 2011

Grid computing is emerging as a key part of the infrastructure for a wide range of disciplines in science and engineering, including astronomy, high energy physics, molecular biology and earth sciences. These applications handle large data sets that need to be transferred and replicated among different grid sites. A data grid deals with data intensive applications in scientific and enterprise computing. Data grid technology is developed to permit data sharing across many organizations in geographically disperse locations. Replication of data to different sites will help researchers around the world analyse and initiate future experiments. The general idea of replication is to store copies of data in different locations so that data can be easily recovered if a copy at one location is lost or unavailable. In a large-scale data grid, replication provides a suitable solution for managing data files, which enhances data reliability and availability. In this paper, a Modified BHR algorithm is proposed to overcome the limitations of the standard BHR algorithm. The algorithm is simulated using a data grid simulator, OptorSim, developed by European Data Grid projects. The performance of the proposed algorithm is improved by minimizing the data access time and avoiding unnecessary replication. © 2010 Elsevier B.V. All rights reserved.


Sashi K.,SNR Sons College | Thanamani A.S.,NGM College
DSDE 2010 - International Conference on Data Storage and Data Engineering | Year: 2010

Grid computing is emerging as a key enabling infrastructure for a wide range of disciplines in Science and Engineering. Data grids provide distributed resources for dealing with large scale applications that generate huge volume of data sets. Data replication, a technique much discussed by data grid researchers in past years creates multiple copies of file and stores them in conventional locations to shorten file access times. One of the challenges in data replication is creation of replicas and replica placement. Dynamic creation of replicas in a suitable site by data replication strategy can increase the systems performance. When creating replicas a decision has to be made on when to create replicas and which one to be created. This decision is based on popularity of file. Placement of replicas selects the best site where replicas should be placed. Placing the replicas in the appropriate site reduces the bandwidth consumption and reduces the job execution time. This paper discusses about dynamic creation of replicas and replica placement. It is implemented by using a data grid simulator, Optorsim developed by European data grid projects. © 2010 IEEE.


Yogeswari B.,NGM College | Kanakaraju R.,NGM College | Boopathi S.,Bharathiar University | Kolandaivel P.,Bharathiar University
Journal of Molecular Graphics and Modelling | Year: 2012

Molecular dynamics (MD) simulations were carried out to study the conformational characteristics of Glycine Dipeptide (GD) in the presence of explicit water molecules for over 10 ns with a MD time step of 2 fs. The density functional theory (DFT) methods with 6-311G** basis set have been employed to study the effects of microsolvation on the conformations of GD with 5-10 water molecules. The interaction energy with BSSE corrections and the strength of the intermolecular hydrogen bond interactions have been analyzed. The Bader's Atoms in Molecules (AIM) theory has been employed to investigate H-bonding patterns in water interacting complexes. The natural bond orbital (NBO) analysis has been carried out to analyze the charge transfer between proton acceptor to the antibonding orbital of the XH bond in the hydrated complexes. NMR calculations have been carried out at B3LYP/6-311G (2d, 2p) level of theory to analyse the changes in structure and hydrogen bonding environment that occur upon solvation. © 2012 Elsevier Inc. All rights reserved.


Karthika M.,NGM College | Senthilkumar L.,Bharathiar University | Kanakaraju R.,NGM College
Structural Chemistry | Year: 2014

A comprehensive theoretical investigation has been performed to study the six most stable complexes of isolated, mono, and hexahydrated 6-selenoguanine tautomers. The ground state geometries are studied at the density-functional theory and Møller-Plesset Perturbation theory implementing the 6-311++G (2d, 2p) basis set. The intermolecular distances between the water molecule and the acceptor atom of 6-selenoguanine is about 0.6 Å longer for hydrogen bonds involving selenium atom. The relative Gibbs free energy of the 6-selenoguanine tautomers favors the selenone tautomer. The majority of the stable monohydrated complexes are the one in which the oxygen atom of water accepts the acidic N7-H proton while donating a proton to the carbonyl selenium atom of 6-selenoguanine; the interaction toward N7-H being stronger than that with the selenium site. The amino group planarity has been found to be increased in the hydrated complexes. The examination of molecular orbital reveals a moderate band gap between the donor and acceptor atoms of isolated and hydrated complexes. An excellent linear correlation is found to exist between electron density and laplacian of electron density with hydrogen-bond length through atoms in molecule analysis. The natural bond orbital analysis shows a maximum charge transfer of 0.060e for selenium acceptors and around 0.025e for selenium donors. © 2013 Springer Science+Business Media New York.


Karthika M.,NGM College | Senthilkumar L.,Bharathiar University | Kanakaraju R.,NGM College
Structural Chemistry | Year: 2012

The optimized geometries and energies of isolated and hydrated 6,8-dithioguanine tautomers have been studied using density functional theory and Møller-Plesset Perturbation theory implementing 6-311++G(d,p) atomic basis set. Depending on the nature of the tautomers, cyclic structures are formed where water molecules accept the NH/SH protons and donates a proton to the nitrogen or thiocarbonyl sulfur atoms. The intermolecular distances between the water molecule and the acceptor atom of 6,8-dithioguanine is about 0.5-0.7 Å longer for hydrogen bonds involving sulfur atoms. The amino group planarity has been found to be increased in the hydrated complexes as a result of hydration. The relative order of stability based on total energy of the 6,8-dithioguanine tautomers in both free and hydrated form favor the thione tautomer. The examination of molecular orbital reveals that the HOMO is localized on five-membered imidazole ring and LUMO on six-membered pyrimidine ring system. From atoms in molecules (AIM) theory an excellent linear correlation is found to exist between electron density and Laplacian of electron density with hydrogen bond length. The natural bond orbital (NBO) analysis shows a maximum charge transfer of 0.059e for O-H···S bonds and around 0.045e for S-H···O bonds. © Springer Science+Business Media, LLC 2012.


Karthika M.,NGM College | Senthilkumar L.,Bharathiar University | Kanakaraju R.,NGM College
Computational and Theoretical Chemistry | Year: 2012

The intermolecular interactions between caffeine and theophylline have been studied using their geometries, energies and topological features of the electron density with density functional theory (DFT) and MP2 methods implementing the 6-311G (d, p) atomic basis set. Sixteen caffeine-theophylline complexes were found on the potential energy surface involving NH...N, NH...O, CH...N and CH...O hydrogen bonds. The complex with conventional NH...N hydrogen bond along with a strong CH...O bond is found to be the most stable structure at MP2/6-311G (d, p) and B3LYP/6-311G (d, p) level of theories. From atoms in molecule (AIM) analysis an excellent linear correlation is shown to exist between the hydrogen bond length, electron density [ρ(r)] and its Laplacian [∇ 2ρ(r)] at the bond critical points. The natural bonding orbital analysis on the most stable complex in which NH...N and CH...O hydrogen bonding interactions are dominant, reveals that imidazole nitrogen of caffeine has offered large amount of lone pairs (0.036) to the contacting σ *(NH) antibond orbital of theophylline and carbonyl oxygen (amide moiety) of theophylline offers lone pair (0.004) to σ *(CH) antibond orbital of caffeine. © 2011 Elsevier B.V..

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